$MFG
MIZUHO FINANCIAL GROUP INC Stock $mfg

$mfg Overview Financials Valuation SEC Filings Company Website

2023 Q1 Form 20-F Financial Statement

#000119312523176656 Filed on June 28, 2023

Income Statement

Concept	2023 Q1	2023	2022 Q1
Revenue		$4277B
YoY Change		102.34%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$85.27B	$166.9B	$81.43B
YoY Change	4.72%	0.78%	-3.81%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense		$2180B
YoY Change		482.7%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$89.00B	$779.0B	$48.77B
YoY Change	82.51%	28.99%	-63.54%
Income Tax	$76.30B	$218.8B	-$6.263B
% Of Pretax Income	85.72%	28.09%	-12.84%
Net Earnings	$12.25B	$555.5B	$51.82B
YoY Change	-76.36%	4.72%	-55.56%
Net Earnings / Revenue		12.99%
Basic Earnings Per Share		-$5.52
Diluted Earnings Per Share	$4.83	$219.20	$20.45M
COMMON SHARES
Basic Shares Outstanding	826.7K	2.537B
Diluted Shares Outstanding		2.537B

Balance Sheet

Concept	2023 Q1	2023	2022 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$67990B		$52170B
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$1106B	$1106B	$1096B
YoY Change	0.9%	0.9%	-3.48%
Goodwill	$92.93B		$92.70B
YoY Change	0.25%		0.0%
Intangibles	$44.68B		$47.94B
YoY Change	-6.8%
Long-Term Investments	$436.9B	$436.9B	$352.2B
YoY Change	24.05%	24.05%
Other Assets	$1175B	$1175B	$1048B
YoY Change	12.18%	12.18%	-8.13%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$254300B	$254300B	$237100B
YoY Change	7.25%	7.25%	5.09%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$126.7B	$126.7B	$120.1B
YoY Change	5.53%	5.53%	15.29%
Deferred Revenue
YoY Change
Short-Term Debt	$32770B	$32770B	$27510B
YoY Change	19.14%	19.14%	9.45%
Long-Term Debt Due	$7.720B	$7.720B
YoY Change		-99.59%
Total Short-Term Liabilities	$32900B	$32900B	$120.1B
YoY Change	27304.68%	27304.68%	15.29%
LONG-TERM LIABILITIES
Long-Term Debt	$15530B	$15530B	$17300B
YoY Change	-10.27%	-10.27%	-2.58%
Other Long-Term Liabilities	$23350B	$23350B	$18800B
YoY Change	24.23%	24.23%	18.66%
Total Long-Term Liabilities	$38880B	$38880B	$36100B
YoY Change	7.69%	7.69%	7.43%
TOTAL LIABILITIES
Total Short-Term Liabilities	$32900B	$32900B	$120.1B
Total Long-Term Liabilities	$38880B	$38880B	$36100B
Total Liabilities	$245100B	$245100B	$228000B
YoY Change	7.52%	7.52%	5.39%
SHAREHOLDERS EQUITY
Retained Earnings	$2442B		$2666B
YoY Change	-8.38%
Common Stock	$5833B		$5817B
YoY Change	0.27%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$8.786B		$8.342B
YoY Change	5.32%
Treasury Stock Shares	$5.027M		$4.659M
Shareholders Equity	$9133B	$9133B	$9077B
YoY Change
Total Liabilities & Shareholders Equity	$254300B	$254300B	$237100B
YoY Change	7.25%	7.25%	5.09%

Cashflow Statement

Concept	2023 Q1	2023	2022 Q1
OPERATING ACTIVITIES
Net Income	$12.25B	$555.5B	$51.82B
YoY Change	-76.36%	4.72%	-55.56%
Depreciation, Depletion And Amortization	$85.27B	$166.9B	$81.43B
YoY Change	4.72%	0.78%	-3.81%
Cash From Operating Activities	$12750B	$8867B	$6920B
YoY Change	84.32%	80.33%	8.66%
INVESTING ACTIVITIES
Capital Expenditures	$103.8B	$183.2B	-$84.44B
YoY Change	-222.98%	-231.53%	-36.18%
Acquisitions
YoY Change
Other Investing Activities	$993.6B	$6789B	-$2522B
YoY Change	-139.39%	-494.42%	196.14%
Cash From Investing Activities	$889.7B	$6606B	-$2607B
YoY Change	-134.13%	-455.05%	164.9%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	-$438.0M	-$699.0M	-$98.00M
YoY Change	346.94%	-33.68%	-70.21%
Debt Paid & Issued, Net		$2986B
YoY Change		9.97%
Cash From Financing Activities	-132.9B	-611.1B	-520.8B
YoY Change	-74.49%	17.06%	322.27%
NET CHANGE
Cash From Operating Activities	12750B	8867B	6920B
Cash From Investing Activities	889.7B	6606B	-2607B
Cash From Financing Activities	-132.9B	-611.1B	-520.8B
Net Change In Cash	13510B	14860B	3792B
YoY Change	256.32%	486.35%	-27.92%
FREE CASH FLOW
Cash From Operating Activities	$12750B	$8867B	$6920B
Capital Expenditures	$103.8B	$183.2B	-$84.44B
Free Cash Flow	$12650B	$8684B	$7004B
YoY Change	80.62%	71.74%	7.74%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
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CY2023	dei	Document Type DocumentType	20-F
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CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-03-31
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--03-31
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Document Shell Company Report DocumentShellCompanyReport	false
CY2023	dei	Entity File Number EntityFileNumber	001-33098
CY2023	dei	Entity Registrant Name EntityRegistrantName	Mizuho Financial Group, Inc.
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	M0
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CY2023	dei	Entity Address Country EntityAddressCountry	JP
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CY2021	us-gaap	Interest Expense Other Short Term Borrowings InterestExpenseOtherShortTermBorrowings	18432000000
CY2022	us-gaap	Interest Expense Other Short Term Borrowings InterestExpenseOtherShortTermBorrowings	5623000000
CY2023	us-gaap	Interest Expense Other Short Term Borrowings InterestExpenseOtherShortTermBorrowings	59314000000
CY2021	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	180026000000
CY2022	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	190713000000
CY2023	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	270111000000
CY2021	us-gaap	Interest Expense InterestExpense	467939000000
CY2022	us-gaap	Interest Expense InterestExpense	374132000000
CY2023	us-gaap	Interest Expense InterestExpense	2180064000000
CY2021	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	988617000000
CY2022	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1069809000000
CY2023	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1208727000000
CY2021	mfg	Provision Credit For Loan Losses ProvisionCreditForLoanLosses	112776000000
CY2022	mfg	Provision Credit For Loan Losses ProvisionCreditForLoanLosses	214408000000
CY2023	mfg	Provision Credit For Loan Losses ProvisionCreditForLoanLosses	93753000000
CY2021	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	875841000000
CY2022	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	855401000000
CY2023	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	1114974000000
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	912684000000
CY2022	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	980000000000
CY2023	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	984345000000
CY2021	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	89267000000
CY2022	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	91611000000
CY2023	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	189526000000
CY2021	us-gaap	Trading Gains Losses TradingGainsLosses	120596000000
CY2022	us-gaap	Trading Gains Losses TradingGainsLosses	-491947000000
CY2023	us-gaap	Trading Gains Losses TradingGainsLosses	-603910000000
CY2021	us-gaap	Debt Securities Gain Loss DebtSecuritiesGainLoss	-22032000000
CY2022	us-gaap	Debt Securities Gain Loss DebtSecuritiesGainLoss	-14777000000
CY2023	us-gaap	Debt Securities Gain Loss DebtSecuritiesGainLoss	5167000000
CY2021	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	850567000000
CY2022	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-60563000000
CY2023	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	135601000000
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	31027000000
CY2022	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	34587000000
CY2023	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-26999000000
CY2021	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	7125000000
CY2022	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	9943000000
CY2023	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	4920000000
CY2021	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	52086000000
CY2022	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	120936000000
CY2023	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	199453000000
CY2021	us-gaap	Noninterest Income NoninterestIncome	2041320000000
CY2022	us-gaap	Noninterest Income NoninterestIncome	669790000000
CY2023	us-gaap	Noninterest Income NoninterestIncome	888103000000
CY2021	us-gaap	Labor And Related Expense LaborAndRelatedExpense	685692000000
CY2022	us-gaap	Labor And Related Expense LaborAndRelatedExpense	669474000000
CY2023	us-gaap	Labor And Related Expense LaborAndRelatedExpense	694027000000
CY2021	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	623732000000
CY2022	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	611326000000
CY2023	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	692879000000
CY2021	us-gaap	Occupancy Net OccupancyNet	206470000000
CY2022	us-gaap	Occupancy Net OccupancyNet	201987000000
CY2023	us-gaap	Occupancy Net OccupancyNet	164603000000
CY2021	mfg	Fees And Commission Expenses FeesAndCommissionExpenses	190489000000
CY2022	mfg	Fees And Commission Expenses FeesAndCommissionExpenses	203957000000
CY2023	mfg	Fees And Commission Expenses FeesAndCommissionExpenses	202347000000
CY2021	mfg	Provision Credit For Losses On Off Balance Sheet Instruments ProvisionCreditForLossesOnOffBalanceSheetInstruments	18007000000
CY2022	mfg	Provision Credit For Losses On Off Balance Sheet Instruments ProvisionCreditForLossesOnOffBalanceSheetInstruments	-14819000000
CY2023	mfg	Provision Credit For Losses On Off Balance Sheet Instruments ProvisionCreditForLossesOnOffBalanceSheetInstruments	6581000000
CY2021	us-gaap	Other Noninterest Expense OtherNoninterestExpense	164007000000
CY2022	us-gaap	Other Noninterest Expense OtherNoninterestExpense	95754000000
CY2023	us-gaap	Other Noninterest Expense OtherNoninterestExpense	173470000000
CY2021	us-gaap	Noninterest Expense NoninterestExpense	1888397000000
CY2022	us-gaap	Noninterest Expense NoninterestExpense	1767679000000
CY2023	us-gaap	Noninterest Expense NoninterestExpense	1933907000000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1028764000000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-242488000000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	69170000000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	210716000000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-141017000000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	35142000000
CY2021	us-gaap	Profit Loss ProfitLoss	818048000000
CY2022	us-gaap	Profit Loss ProfitLoss	-101471000000
CY2023	us-gaap	Profit Loss ProfitLoss	34028000000
CY2021	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	236283000000
CY2022	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3251000000
CY2023	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	48037000000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	581765000000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	-104722000000
CY2023	us-gaap	Net Income Loss NetIncomeLoss	-14009000000
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	229.27
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-41.28
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-5.52
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	229.26
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-41.28
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-5.52
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	75
CY2022	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	80
CY2023	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	85
CY2021	us-gaap	Profit Loss ProfitLoss	818048000000
CY2022	us-gaap	Profit Loss ProfitLoss	-101471000000
CY2023	us-gaap	Profit Loss ProfitLoss	34028000000
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	11534000000
CY2022	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-17020000000
CY2023	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-7828000000
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	22695000000
CY2022	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	185298000000
CY2023	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	135849000000
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-328066000000
CY2022	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	41385000000
CY2023	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-68223000000
CY2021	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option After Tax And Reclassification Adjustment OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionAfterTaxAndReclassificationAdjustment	-35187000000
CY2022	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option After Tax And Reclassification Adjustment OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionAfterTaxAndReclassificationAdjustment	-300000000
CY2023	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option After Tax And Reclassification Adjustment OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionAfterTaxAndReclassificationAdjustment	13443000000
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	327108000000
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	126593000000
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	209687000000
CY2021	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	1145156000000
CY2022	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	25122000000
CY2023	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	243715000000
CY2021	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	235784000000
CY2022	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	7846000000
CY2023	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	48442000000
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	909372000000
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	17276000000
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	195273000000
CY2021Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	9688157000000
CY2022Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	9442231000000
CY2023Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	9725134000000
CY2021	us-gaap	Profit Loss ProfitLoss	818048000000
CY2022	us-gaap	Profit Loss ProfitLoss	-101471000000
CY2023	us-gaap	Profit Loss ProfitLoss	34028000000
CY2021	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	236283000000
CY2022	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3251000000
CY2023	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	48037000000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	581765000000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	-104722000000
CY2023	us-gaap	Net Income Loss NetIncomeLoss	-14009000000
CY2021	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	231677000000
CY2022	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	228397000000
CY2023	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	238997000000
CY2021	mfg	Provision Credit For Loan Losses ProvisionCreditForLoanLosses	112776000000
CY2022	mfg	Provision Credit For Loan Losses ProvisionCreditForLoanLosses	214408000000
CY2023	mfg	Provision Credit For Loan Losses ProvisionCreditForLoanLosses	93753000000
CY2021	mfg	Gain Loss On Securities Investments Net GainLossOnSecuritiesInvestmentsNet	828535000000
CY2022	mfg	Gain Loss On Securities Investments Net GainLossOnSecuritiesInvestmentsNet	-75340000000
CY2023	mfg	Gain Loss On Securities Investments Net GainLossOnSecuritiesInvestmentsNet	140768000000
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	31027000000
CY2022	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	34587000000
CY2023	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-26999000000
CY2021	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	-207400000000
CY2022	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	-517989000000
CY2023	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	-439767000000
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	50701000000
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-255365000000
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-143842000000
CY2021	mfg	Increase Decrease In Trading Account Assets IncreaseDecreaseInTradingAccountAssets	-1567897000000
CY2022	mfg	Increase Decrease In Trading Account Assets IncreaseDecreaseInTradingAccountAssets	-2386304000000
CY2023	mfg	Increase Decrease In Trading Account Assets IncreaseDecreaseInTradingAccountAssets	4031782000000
CY2021	us-gaap	Increase Decrease In Trading Liabilities IncreaseDecreaseInTradingLiabilities	-1984509000000
CY2022	us-gaap	Increase Decrease In Trading Liabilities IncreaseDecreaseInTradingLiabilities	3634056000000
CY2023	us-gaap	Increase Decrease In Trading Liabilities IncreaseDecreaseInTradingLiabilities	4235704000000
CY2021	us-gaap	Increase Decrease In Loans Held For Sale IncreaseDecreaseInLoansHeldForSale	-30250000000
CY2022	us-gaap	Increase Decrease In Loans Held For Sale IncreaseDecreaseInLoansHeldForSale	126804000000
CY2023	us-gaap	Increase Decrease In Loans Held For Sale IncreaseDecreaseInLoansHeldForSale	72356000000
CY2021	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	-8052000000
CY2022	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	-4680000000
CY2023	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	179772000000
CY2021	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-72850000000
CY2022	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	2783000000
CY2023	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	259428000000
CY2021	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-595159000000
CY2022	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	1044392000000
CY2023	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-294794000000
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	468756000000
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	5498087000000
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1006913000000
CY2021	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	28041466000000
CY2022	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	36330397000000
CY2023	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	35864487000000
CY2021	mfg	Proceeds From Sales Of Equity Securities ProceedsFromSalesOfEquitySecurities	3089202000000
CY2022	mfg	Proceeds From Sales Of Equity Securities ProceedsFromSalesOfEquitySecurities	2526075000000
CY2023	mfg	Proceeds From Sales Of Equity Securities ProceedsFromSalesOfEquitySecurities	930586000000
CY2021	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	31521663000000
CY2022	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	39008678000000
CY2023	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	39537476000000
CY2021	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	116060000000
CY2022	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	178955000000
CY2023	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	227711000000
CY2021	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	69491642000000
CY2022	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	80478884000000
CY2023	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	68223956000000
CY2021	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	134660000000
CY2022	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	714794000000
CY2023	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	677508000000
CY2021	mfg	Payments To Acquire Equity Securities PaymentsToAcquireEquitySecurities	2979434000000
CY2022	mfg	Payments To Acquire Equity Securities PaymentsToAcquireEquitySecurities	2208196000000
CY2023	mfg	Payments To Acquire Equity Securities PaymentsToAcquireEquitySecurities	914215000000
CY2021	us-gaap	Proceeds From Sale Of Loans Held For Investment ProceedsFromSaleOfLoansHeldForInvestment	1847102000000
CY2022	us-gaap	Proceeds From Sale Of Loans Held For Investment ProceedsFromSaleOfLoansHeldForInvestment	2046573000000
CY2023	us-gaap	Proceeds From Sale Of Loans Held For Investment ProceedsFromSaleOfLoansHeldForInvestment	492933000000
CY2021	us-gaap	Payments For Proceeds From Other Loans And Leases PaymentsForProceedsFromOtherLoansAndLeases	1502445000000
CY2022	us-gaap	Payments For Proceeds From Other Loans And Leases PaymentsForProceedsFromOtherLoansAndLeases	1397302000000
CY2023	us-gaap	Payments For Proceeds From Other Loans And Leases PaymentsForProceedsFromOtherLoansAndLeases	2615468000000
CY2021	mfg	Proceeds From Payments For Call Loans Funds Sold And Receivables Under Resale Agreements And Securities Borrowing Transactions ProceedsFromPaymentsForCallLoansFundsSoldAndReceivablesUnderResaleAgreementsAndSecuritiesBorrowingTransactions	6906483000000
CY2022	mfg	Proceeds From Payments For Call Loans Funds Sold And Receivables Under Resale Agreements And Securities Borrowing Transactions ProceedsFromPaymentsForCallLoansFundsSoldAndReceivablesUnderResaleAgreementsAndSecuritiesBorrowingTransactions	-147806000000
CY2023	mfg	Proceeds From Payments For Call Loans Funds Sold And Receivables Under Resale Agreements And Securities Borrowing Transactions ProceedsFromPaymentsForCallLoansFundsSoldAndReceivablesUnderResaleAgreementsAndSecuritiesBorrowingTransactions	1790227000000
CY2021	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	13664000000
CY2022	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	18720000000
CY2023	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	9813000000
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	211495000000
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	136238000000
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	185583000000
CY2021	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	218259000000
CY2022	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	50699000000
CY2023	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	2872000000
CY2021	us-gaap	Payments To Acquire Additional Interest In Subsidiaries PaymentsToAcquireAdditionalInterestInSubsidiaries	47515000000
CY2022	us-gaap	Payments To Acquire Additional Interest In Subsidiaries PaymentsToAcquireAdditionalInterestInSubsidiaries	93005000000
CY2023	us-gaap	Payments To Acquire Additional Interest In Subsidiaries PaymentsToAcquireAdditionalInterestInSubsidiaries	48887000000
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2613292000000
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-5016128000000
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	6190488000000
CY2021	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	4394481000000
CY2022	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	3589567000000
CY2023	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	5834904000000
CY2021	mfg	Proceeds From Payments For Call Money Funds Purchased And Payable Under Resale Agreements And Securities Lending Transactions ProceedsFromPaymentsForCallMoneyFundsPurchasedAndPayableUnderResaleAgreementsAndSecuritiesLendingTransactions	-962754000000
CY2022	mfg	Proceeds From Payments For Call Money Funds Purchased And Payable Under Resale Agreements And Securities Lending Transactions ProceedsFromPaymentsForCallMoneyFundsPurchasedAndPayableUnderResaleAgreementsAndSecuritiesLendingTransactions	9268000000
CY2023	mfg	Proceeds From Payments For Call Money Funds Purchased And Payable Under Resale Agreements And Securities Lending Transactions ProceedsFromPaymentsForCallMoneyFundsPurchasedAndPayableUnderResaleAgreementsAndSecuritiesLendingTransactions	4444768000000
CY2021	mfg	Increase Decrease In Due To Trust Account IncreaseDecreaseInDueToTrustAccount	131056000000
CY2022	mfg	Increase Decrease In Due To Trust Account IncreaseDecreaseInDueToTrustAccount	9454000000
CY2023	mfg	Increase Decrease In Due To Trust Account IncreaseDecreaseInDueToTrustAccount	359135000000
CY2021	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	4085165000000
CY2022	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-1711421000000
CY2023	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-4338379000000
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	2568730000000
CY2022	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	3004293000000
CY2023	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	4701954000000
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1511050000000
CY2022	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	2715054000000
CY2023	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	2985756000000
CY2021	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	236868000000
CY2022	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	101755000000
CY2023	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	36924000000
CY2021	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	37928000000
CY2022	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	80493000000
CY2023	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	58811000000
CY2021	us-gaap	Proceeds From Sale Of Treasury Stock ProceedsFromSaleOfTreasuryStock	854000000
CY2022	us-gaap	Proceeds From Sale Of Treasury Stock ProceedsFromSaleOfTreasuryStock	874000000
CY2023	us-gaap	Proceeds From Sale Of Treasury Stock ProceedsFromSaleOfTreasuryStock	1615000000
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1849000000
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1927000000
CY2023	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2314000000
CY2021	mfg	Payments For Purchases Of Treasury Stock Of Subsidiaries PaymentsForPurchasesOfTreasuryStockOfSubsidiaries	5414000000
CY2022	mfg	Payments For Purchases Of Treasury Stock Of Subsidiaries PaymentsForPurchasesOfTreasuryStockOfSubsidiaries	0
CY2023	mfg	Payments For Purchases Of Treasury Stock Of Subsidiaries PaymentsForPurchasesOfTreasuryStockOfSubsidiaries	0
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	190498000000
CY2022	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	196783000000
CY2023	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	209457000000
CY2021	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	15753000000
CY2022	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	18095000000
CY2023	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	21732000000
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	8691908000000
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1991438000000
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	7762851000000
CY2021	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	235610000000
CY2022	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	966796000000
CY2023	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	857754000000
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	6782982000000
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	3440193000000
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	15818006000000
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	41951114000000
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	48734096000000
CY2022Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	52174289000000
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	48734096000000
CY2022Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	52174289000000
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	67992295000000
CY2021	us-gaap	Interest Paid Net InterestPaidNet	497422000000
CY2022	us-gaap	Interest Paid Net InterestPaidNet	274530000000
CY2023	us-gaap	Interest Paid Net InterestPaidNet	2030281000000
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	216996000000
CY2022	us-gaap	Income Taxes Paid IncomeTaxesPaid	164408000000
CY2023	us-gaap	Income Taxes Paid IncomeTaxesPaid	133370000000
CY2021	us-gaap	Transfer To Investments TransferToInvestments	20335000000
CY2022	us-gaap	Transfer To Investments TransferToInvestments	15916000000
CY2023	us-gaap	Transfer To Investments TransferToInvestments	2089000000
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	2240655000000
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	995932000000
CY2023Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	23233769000000
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	280980000000
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family: Times New Roman; font-size: 10pt; margin-top: 18pt; margin-bottom: 0pt;"><div style="font-style: normal; letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-style:italic;display:inline;">Use of estimates </div></div></div> <div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;"></div></div> <div style="font-family: Times New Roman; font-size: 10pt; margin-top: 6pt; margin-bottom: 0pt;;text-indent: 0px;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">The preparation of the consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect reported amounts and related disclosures. Specific areas, among others, requiring the application of management’s estimates and judgment include assumptions pertaining to the allowance for credit losses, valuation of loans held-for-sale, valuation of deferred tax assets, valuation of derivative financial instruments, valuation of investments, valuation of certain long-term debt where the fair value option has been elected, valuation of pension and other employee benefits, and impairment of long-lived assets. During times of geopolitical unrest such as the situation in Russia and Ukraine and economic uncertainty such as elevated global inflation, estimates become more sensitive and it is reasonably possible that actual results could differ from estimates and assumptions made. </div></div></div> <div style="letter-spacing: 0px; top: 0px; background: none;;display:inline;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px; background: none; text-decoration: none;;display:inline;"> </div></div> <div style="font-size: 8pt; margin-top: 0pt; margin-bottom: 0pt;"><div style="font-size: 8pt; letter-spacing: 0px; top: 0px;;display:inline;"> </div></div>
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CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	328551000000
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	1114660000000
CY2023Q1	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	1915108000000
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CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	329339000000
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	1250802000000
CY2023Q1	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	2050107000000
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	16686719000000
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	3310463000000
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	16693211000000
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	3312191000000
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	2271914000000
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	1002233000000
CY2023Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	23279549000000
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	279982000000
CY2021	mfg	Financing Receivable Allowance For Credit Losses Other Adjustments FinancingReceivableAllowanceForCreditLossesOtherAdjustments	6329000000
CY2022Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	21846469000000
CY2022Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	26771000000
CY2022Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	2032092000000
CY2022Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	32032000000
CY2022Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	23878561000000
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CY2023Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	22388000000
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CY2023	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	22962000000
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CY2021	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	767598000000
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CY2023	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	106040000000
CY2021Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	186146000000
CY2022Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	207407000000
CY2023Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	207743000000
CY2021Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentCumulativeAmount	5087000000
CY2022Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentCumulativeAmount	6519000000
CY2023Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentCumulativeAmount	5345000000
CY2021Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentCumulativeAmount	9216000000
CY2022Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentCumulativeAmount	11623000000
CY2023Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentCumulativeAmount	13015000000
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CY2022	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	2626000000
CY2023	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	1291000000
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CY2023	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	1459000000
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CY2023Q1	mfg	Unearned Income And Deferred Loan Fees UnearnedIncomeAndDeferredLoanFees	238000000000
CY2022Q1	mfg	Financing Receivable Non Accrual With Allowance FinancingReceivableNonAccrualWithAllowance	1082000000000
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CY2022Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1704067000000
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CY2021	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	302000000
CY2022	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
CY2023	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
CY2021Q1	us-gaap	Goodwill Goodwill	92695000000
CY2022Q1	us-gaap	Goodwill Goodwill	92695000000
CY2023Q1	us-gaap	Goodwill Goodwill	92928000000
CY2021Q1	us-gaap	Goodwill Gross GoodwillGross	167552000000
CY2022Q1	us-gaap	Goodwill Gross GoodwillGross	161993000000
CY2023Q1	us-gaap	Goodwill Gross GoodwillGross	163209000000
CY2021Q1	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	74857000000
CY2022Q1	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	69298000000
CY2023Q1	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	70281000000
CY2022Q1	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	128447000000
CY2022Q1	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	88514000000
CY2022Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	39933000000
CY2023Q1	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	133007000000
CY2023Q1	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	96185000000
CY2023Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	36822000000
CY2022Q1	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	8006000000
CY2022Q1	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	8006000000
CY2023Q1	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	7859000000
CY2023Q1	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	7859000000
CY2022Q1	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	136453000000
CY2022Q1	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	88514000000
CY2022Q1	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	47939000000
CY2023Q1	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	140866000000
CY2023Q1	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	96185000000
CY2023Q1	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	44681000000
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	8513000000
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7961000000
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7706000000
CY2023Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	7210000000
CY2023Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	6698000000
CY2023Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	6194000000
CY2023Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	5564000000
CY2023Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	2559000000
CY2023Q1	us-gaap	Fair Value Of Securities Received As Collateral That Have Been Resold Or Repledged FairValueOfSecuritiesReceivedAsCollateralThatHaveBeenResoldOrRepledged	13379000000000
CY2022Q1	mfg	Pledged Assets Not Separately Reported Other Assets Pledged As Collateral PledgedAssetsNotSeparatelyReportedOtherAssetsPledgedAsCollateral	75000000000
CY2023Q1	mfg	Pledged Assets Not Separately Reported Other Assets Pledged As Collateral PledgedAssetsNotSeparatelyReportedOtherAssetsPledgedAsCollateral	92000000000
CY2022Q1	us-gaap	Debt Securities Trading Restricted DebtSecuritiesTradingRestricted	5426000000000
CY2023Q1	us-gaap	Debt Securities Trading Restricted DebtSecuritiesTradingRestricted	7830000000000
CY2022Q1	mfg	Available For Sales And Held To Maturity Investment Securities Pledged As Collateral AvailableForSalesAndHeldToMaturityInvestmentSecuritiesPledgedAsCollateral	8091000000000
CY2023Q1	mfg	Available For Sales And Held To Maturity Investment Securities Pledged As Collateral AvailableForSalesAndHeldToMaturityInvestmentSecuritiesPledgedAsCollateral	12452000000000
CY2022Q1	mfg	Other Assets Pledged As Collateral OtherAssetsPledgedAsCollateral	3023000000000
CY2023Q1	mfg	Other Assets Pledged As Collateral OtherAssetsPledgedAsCollateral	2059000000000
CY2022Q1	mfg	Assets Pledged As Collateral AssetsPledgedAsCollateral	25671000000000
CY2023Q1	mfg	Assets Pledged As Collateral AssetsPledgedAsCollateral	31148000000000
CY2022Q1	mfg	Deposit Liabilities To Which Pledged Assets Are Related DepositLiabilitiesToWhichPledgedAssetsAreRelated	910000000000
CY2023Q1	mfg	Deposit Liabilities To Which Pledged Assets Are Related DepositLiabilitiesToWhichPledgedAssetsAreRelated	988000000000
CY2022Q1	mfg	Payables Under Repurchase Agreements To Which Pledged Assets Are Related PayablesUnderRepurchaseAgreementsToWhichPledgedAssetsAreRelated	5864000000000
CY2023Q1	mfg	Payables Under Repurchase Agreements To Which Pledged Assets Are Related PayablesUnderRepurchaseAgreementsToWhichPledgedAssetsAreRelated	10542000000000
CY2022Q1	us-gaap	Collateralized Financings CollateralizedFinancings	645000000000
CY2023Q1	us-gaap	Collateralized Financings CollateralizedFinancings	721000000000
CY2022Q1	mfg	Other Short Term Borrowings To Which Pledged Assets Are Related OtherShortTermBorrowingsToWhichPledgedAssetsAreRelated	5113000000000
CY2023Q1	mfg	Other Short Term Borrowings To Which Pledged Assets Are Related OtherShortTermBorrowingsToWhichPledgedAssetsAreRelated	1003000000000
CY2022Q1	us-gaap	Secured Long Term Debt SecuredLongTermDebt	542000000000
CY2023Q1	us-gaap	Secured Long Term Debt SecuredLongTermDebt	2173000000000
CY2022Q1	us-gaap	Secured Debt SecuredDebt	13074000000000
CY2023Q1	us-gaap	Secured Debt SecuredDebt	15427000000000
CY2022Q1	us-gaap	Cash Segregated Under Other Regulations CashSegregatedUnderOtherRegulations	48897000000000
CY2023Q1	us-gaap	Cash Segregated Under Other Regulations CashSegregatedUnderOtherRegulations	64993000000000
CY2022Q1	mfg	Reserve Fund Amount Required To Maintain With Central Banks ReserveFundAmountRequiredToMaintainWithCentralBanks	1678000000000
CY2023Q1	mfg	Reserve Fund Amount Required To Maintain With Central Banks ReserveFundAmountRequiredToMaintainWithCentralBanks	1701000000000
CY2022Q1	us-gaap	Fair Value Of Securities Received As Collateral That Can Be Resold Or Repledged FairValueOfSecuritiesReceivedAsCollateralThatCanBeResoldOrRepledged	16632000000000
CY2023Q1	us-gaap	Fair Value Of Securities Received As Collateral That Can Be Resold Or Repledged FairValueOfSecuritiesReceivedAsCollateralThatCanBeResoldOrRepledged	15529000000000
CY2022Q1	us-gaap	Fair Value Of Securities Received As Collateral That Have Been Resold Or Repledged FairValueOfSecuritiesReceivedAsCollateralThatHaveBeenResoldOrRepledged	14865000000000
CY2023Q1	us-gaap	Time Deposits TimeDeposits	57774061000000
CY2022Q1	us-gaap	Deposit Liabilities Reclassified As Loans Receivable1 DepositLiabilitiesReclassifiedAsLoansReceivable1	585000000000
CY2023Q1	us-gaap	Deposit Liabilities Reclassified As Loans Receivable1 DepositLiabilitiesReclassifiedAsLoansReceivable1	586000000000
CY2022Q1	us-gaap	Short Term Bank Loans And Notes Payable ShortTermBankLoansAndNotesPayable	5105225000000
CY2023Q1	us-gaap	Short Term Bank Loans And Notes Payable ShortTermBankLoansAndNotesPayable	876036000000
CY2022Q1	mfg	Other Short Term Borrowings Other OtherShortTermBorrowingsOther	148518000000
CY2023Q1	mfg	Other Short Term Borrowings Other OtherShortTermBorrowingsOther	262040000000
CY2022Q1	us-gaap	Other Short Term Borrowings OtherShortTermBorrowings	7566771000000
CY2023Q1	us-gaap	Other Short Term Borrowings OtherShortTermBorrowings	3397329000000
CY2022Q1	us-gaap	Finance Lease Liability FinanceLeaseLiability	4621000000
CY2023Q1	us-gaap	Finance Lease Liability FinanceLeaseLiability	6863000000
CY2022Q1	us-gaap	Participating Mortgage Loans Participation Liabilities Amount ParticipatingMortgageLoansParticipationLiabilitiesAmount	220312000000
CY2023Q1	us-gaap	Participating Mortgage Loans Participation Liabilities Amount ParticipatingMortgageLoansParticipationLiabilitiesAmount	245176000000
CY2022Q1	us-gaap	Senior Notes SeniorNotes	8600493000000
CY2023Q1	us-gaap	Senior Notes SeniorNotes	11245475000000
CY2022Q1	us-gaap	Junior Subordinated Notes JuniorSubordinatedNotes	3752790000000
CY2023Q1	us-gaap	Junior Subordinated Notes JuniorSubordinatedNotes	3395509000000
CY2022Q1	us-gaap	Long Term Debt LongTermDebt	12578216000000
CY2023Q1	us-gaap	Long Term Debt LongTermDebt	14893023000000
CY2022Q1	us-gaap	Long Term Notes And Loans LongTermNotesAndLoans	12353283000000
CY2023Q1	us-gaap	Long Term Notes And Loans LongTermNotesAndLoans	14640984000000
CY2023Q1	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	1177938000000
CY2023Q1	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	3757328000000
CY2023Q1	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	702968000000
CY2023Q1	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	1428227000000
CY2023Q1	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	1291313000000
CY2023Q1	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	6535249000000
CY2023Q1	us-gaap	Long Term Debt LongTermDebt	14893023000000
CY2022Q1	us-gaap	Receivables From Brokers Dealers And Clearing Organizations ReceivablesFromBrokersDealersAndClearingOrganizations	3049874000000
CY2023Q1	us-gaap	Receivables From Brokers Dealers And Clearing Organizations ReceivablesFromBrokersDealersAndClearingOrganizations	4469286000000
CY2022Q1	us-gaap	Other Receivables OtherReceivables	557842000000
CY2023Q1	us-gaap	Other Receivables OtherReceivables	468344000000
CY2022Q1	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	1549483000000
CY2023Q1	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	988881000000
CY2022Q1	mfg	Derivative Collateral Right To Reclaim Cash Through Exchange DerivativeCollateralRightToReclaimCashThroughExchange	466531000000
CY2023Q1	mfg	Derivative Collateral Right To Reclaim Cash Through Exchange DerivativeCollateralRightToReclaimCashThroughExchange	183747000000
CY2022Q1	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	1006849000000
CY2023Q1	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	890350000000
CY2022Q1	mfg	Prepaid Pension Cost PrepaidPensionCost	762147000000
CY2023Q1	mfg	Prepaid Pension Cost PrepaidPensionCost	768998000000
CY2022Q1	mfg	Operating Lease Right Of Use Assets OperatingLeaseRightOfUseAssets	570171000000
CY2023Q1	mfg	Operating Lease Right Of Use Assets OperatingLeaseRightOfUseAssets	549668000000
CY2022Q1	us-gaap	Security Deposit SecurityDeposit	91766000000
CY2023Q1	us-gaap	Security Deposit SecurityDeposit	83343000000
CY2022Q1	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	156639000000
CY2023Q1	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	228995000000
CY2022Q1	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	775940000000
CY2023Q1	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	1069348000000
CY2022Q1	us-gaap	Other Assets OtherAssets	8987242000000
CY2023Q1	us-gaap	Other Assets OtherAssets	9700960000000
CY2022Q1	srt	Payables To Broker Dealers And Clearing Organizations PayablesToBrokerDealersAndClearingOrganizations	1406965000000
CY2023Q1	srt	Payables To Broker Dealers And Clearing Organizations PayablesToBrokerDealersAndClearingOrganizations	1799116000000
CY2022Q1	us-gaap	Accounts Payable Other Current And Noncurrent AccountsPayableOtherCurrentAndNoncurrent	494538000000
CY2023Q1	us-gaap	Accounts Payable Other Current And Noncurrent AccountsPayableOtherCurrentAndNoncurrent	527493000000
CY2022Q1	mfg	Guarantee Obligations Carrying Value GuaranteeObligationsCarryingValue	810776000000
CY2023Q1	mfg	Guarantee Obligations Carrying Value GuaranteeObligationsCarryingValue	817448000000
CY2022Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	593339000000
CY2023Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	571087000000
CY2022Q1	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	1075591000000
CY2023Q1	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	1008083000000
CY2022Q1	mfg	Derivative Collateral Obligation To Return Cash Through Exchange DerivativeCollateralObligationToReturnCashThroughExchange	327883000000
CY2023Q1	mfg	Derivative Collateral Obligation To Return Cash Through Exchange DerivativeCollateralObligationToReturnCashThroughExchange	81925000000
CY2022Q1	us-gaap	Deferred Revenue DeferredRevenue	113181000000
CY2023Q1	us-gaap	Deferred Revenue DeferredRevenue	112077000000
CY2022Q1	us-gaap	Other Sundry Liabilities OtherSundryLiabilities	1437949000000
CY2023Q1	us-gaap	Other Sundry Liabilities OtherSundryLiabilities	1399466000000
CY2022Q1	us-gaap	Other Liabilities OtherLiabilities	6260222000000
CY2023Q1	us-gaap	Other Liabilities OtherLiabilities	6316695000000
CY2020Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	2539249894
CY2021Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	2539249894
CY2022Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	2539249894
CY2021	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	0
CY2022	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	0
CY2023	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	0
CY2021Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	2539249894
CY2022Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	2539249894
CY2023Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	2539249894
CY2023Q1	mfg	Japan Gaap Capital JapanGaapCapital	2256768000000
CY2023Q1	mfg	Japan Gaap Additional Paidin Capital JapanGaapAdditionalPaidinCapital	1196660000000
CY2023Q1	mfg	Japan Gaap Retained Earnings Accumulated Deficit JapanGaapRetainedEarningsAccumulatedDeficit	2214748000000
CY2022Q1	mfg	Derivative Liabilities Net Amounts Offset Against Collaterals DerivativeLiabilitiesNetAmountsOffsetAgainstCollaterals	1725000000000
CY2023	mfg	Japan Gaap Regulatory Restrictions On Payment Of Dividends JapanGaapRegulatoryRestrictionsOnPaymentOfDividends	Pursuant to the Companies Act, in making a distribution of retained earnings, an entity must set aside in its legal reserve an amount equal to one-tenth of the amount of retained earnings so distributed, until its legal reserve reaches one-quarter of its capital stock.
CY2023Q1	mfg	Japan Gaap Legal Reserve JapanGaapLegalReserve	1201010000000
CY2023Q1	mfg	Japan Gaap Amount Available For Dividend Distribution Without Affecting Capital Adequacy Requirements JapanGaapAmountAvailableForDividendDistributionWithoutAffectingCapitalAdequacyRequirements	2203318000000
CY2023	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	23012000000
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CY2023	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	15803000000
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CY2023	mfg	Additional Loss Absorbency Percentage AdditionalLossAbsorbencyPercentage	0.01
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CY2019Q1	mfg	Japan Gaap Leverage Ratio Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets JapanGaapLeverageRatioRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.03
CY2023	mfg	Capital Requirements And Regulatory Adjustments Over Transitional Period CapitalRequirementsAndRegulatoryAdjustmentsOverTransitionalPeriod	<div style="font-family: Times New Roman; font-size: 10pt; margin-top: 12pt; margin-bottom: 0pt;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">The capital requirements and regulatory adjustments are being phased in over a transitional period as follows: </div></div> <div style="font-size: 12pt; margin-top: 0pt; margin-bottom: 0pt;"><div style="font-size: 12pt; letter-spacing: 0px; top: 0px;;display:inline;"> </div></div> <table cellpadding="0" cellspacing="0" style="margin: 0px auto; border: 0px currentcolor; width: 100%; font-family: "Times New Roman"; font-size: 10pt; border-collapse: collapse; border-spacing: 0px;"> <tr style="font-size: 0px;"> <td style="width: 78%;"></td> <td style="width: 4%; vertical-align: bottom;"></td> <td></td> <td></td> <td></td> <td style="width: 4%; vertical-align: bottom;"></td> <td></td> <td></td> <td></td> <td style="width: 4%; vertical-align: bottom;"></td> <td></td> <td></td> <td></td> <td style="width: 4%; vertical-align: bottom;"></td> <td></td> <td></td> <td></td></tr> <tr style="font-family: Times New Roman; font-size: 8pt; page-break-inside: avoid;"> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"> </td> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"> </td> <td colspan="2" style="vertical-align: bottom; border-bottom: 1pt solid rgb(0, 0, 0);;text-align:center;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-weight:bold;display:inline;">March</div></div><br/> <div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-weight:bold;display:inline;">2022</div></div></td> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"> </td> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"> </td> <td colspan="2" style="vertical-align: bottom; border-bottom: 1pt solid rgb(0, 0, 0);;text-align:center;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-weight:bold;display:inline;">March</div></div><br/> <div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-weight:bold;display:inline;">2023</div></div></td> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"> </td> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"> </td> <td colspan="2" style="vertical-align: bottom; border-bottom: 1pt solid rgb(0, 0, 0);;text-align:center;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-weight:bold;display:inline;">March</div></div><br/> <div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-weight:bold;display:inline;">2024</div></div></td> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"> </td> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"> </td> <td colspan="2" style="vertical-align: bottom; border-bottom: 1pt solid rgb(0, 0, 0);;text-align:center;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-weight:bold;display:inline;">March</div></div><br/> <div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-weight:bold;display:inline;">2025</div></div></td> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"> </td></tr> <tr style="font-family: Times New Roman; font-size: 10pt; page-break-inside: avoid; background-color: rgb(204, 238, 255);"> <td style="vertical-align: top;"><div style="text-indent: -1em; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 1em; line-height: normal;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Minimum Common Equity Tier 1 capital</div></div></td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">4.5</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">4.5</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">4.5</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">4.5</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td></tr> <tr style="font-family: Times New Roman; font-size: 10pt; page-break-inside: avoid;"> <td style="vertical-align: top;"><div style="text-indent: -1em; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 1em; line-height: normal;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Minimum Tier 1 capital</div></div></td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">6.0</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">6.0</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">6.0</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">6.0</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td></tr> <tr style="font-family: Times New Roman; font-size: 10pt; page-break-inside: avoid; background-color: rgb(204, 238, 255);"> <td style="vertical-align: top;"><div style="text-indent: -1em; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 1em; line-height: normal;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Minimum total capital</div></div></td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">8.0</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">8.0</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">8.0</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">8.0</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td></tr> <tr style="font-family: Times New Roman; font-size: 10pt; page-break-inside: avoid;"> <td style="vertical-align: top;"><div style="text-indent: -1em; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 1em; line-height: normal;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Capital conservation buffer</div></div></td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">2.5</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">2.5</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">2.5</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">2.5</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td></tr> <tr style="font-family: Times New Roman; font-size: 10pt; page-break-inside: avoid; background-color: rgb(204, 238, 255);"> <td style="vertical-align: top;"><div style="text-indent: -1em; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 1em; line-height: normal;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Countercyclical capital buffer<div style="font-size: 75%; vertical-align: top;;display:inline;;font-size:8.3px">(1)</div></div></div></td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">0.01</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">0.06</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">0.06</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">0.06</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td></tr> <tr style="font-family: Times New Roman; font-size: 10pt; page-break-inside: avoid;"> <td style="vertical-align: top;"><div style="text-indent: -1em; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 1em; line-height: normal;">Additional loss absorbency requirements for <div style="white-space: nowrap; letter-spacing: 0px; top: 0px;;display:inline;">G-SIBs</div> and <div style="white-space: nowrap; letter-spacing: 0px; top: 0px;;display:inline;">D-SIBs</div><div style="font-size: 75%; vertical-align: top;;display:inline;;font-size:8.3px">(2)</div></div></td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">1.0</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">1.0</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">1.0</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">1.0</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td></tr> <tr style="font-family: Times New Roman; font-size: 10pt; page-break-inside: avoid; background-color: rgb(204, 238, 255);"> <td style="vertical-align: top;"><div style="text-indent: -1em; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 1em; line-height: normal;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Minimum Leverage Ratio</div></div></td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">3.0</td> <td style="vertical-align: bottom; white-space: nowrap;">% </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">3.5</td> <td style="vertical-align: bottom; white-space: nowrap;">%<div style="font-size: 75%; vertical-align: top;;display:inline;;font-size:8.3px">(3)</div> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">3.5</td> <td style="vertical-align: bottom; white-space: nowrap;">%<div style="font-size: 75%; vertical-align: top;;display:inline;;font-size:8.3px">(3)</div> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">3.7</td> <td style="vertical-align: bottom; white-space: nowrap;">%<div style="font-size: 75%; vertical-align: top;;display:inline;;font-size:8.3px">(3)</div> </td></tr></table> <div style="clear: both; max-height: 0px;"></div> <div style="width: 11%; line-height: 8pt; margin-top: 0pt; margin-bottom: 2pt; border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></div> <div style="font-family: Times New Roman; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Notes: </div></div> <table cellpadding="0" cellspacing="0" style="border: 0px currentcolor; width: 100%; font-family: "Times New Roman"; font-size: 10pt; border-collapse: collapse; border-spacing: 0px;"> <tr style="page-break-inside: avoid;"> <td style="width: 5%; vertical-align: top;;text-align:left;">(1)</td> <td style="vertical-align: top;;text-align:left;"><div style="text-align: left; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; line-height: normal;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Figures assume that the countercyclical capital buffer will continue to be 0.06% after March 2024. </div></div></td></tr></table> <div style="clear: both; max-height: 0px;"></div> <table cellpadding="0" cellspacing="0" style="border: 0px currentcolor; width: 100%; font-family: "Times New Roman"; font-size: 10pt; border-collapse: collapse; border-spacing: 0px;"> <tr style="page-break-inside: avoid;"> <td style="width: 5%; vertical-align: top;;text-align:left;">(2)</td> <td style="vertical-align: top;;text-align:left;"><div style="text-align: left; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; line-height: normal;">Figures assume that the additional loss absorbency requirements applied to the Group as a <div style="white-space: nowrap; letter-spacing: 0px; top: 0px;;display:inline;">G-SIB</div> and <div style="white-space: nowrap; letter-spacing: 0px; top: 0px;;display:inline;">D-SIB</div> continue to be 1.0% on a fully effective basis in future years. </div></td></tr></table> <div style="clear: both; max-height: 0px;"></div> <table cellpadding="0" cellspacing="0" style="border: 0px currentcolor; width: 100%; font-family: "Times New Roman"; font-size: 10pt; border-collapse: collapse; border-spacing: 0px;"> <tr style="page-break-inside: avoid;"> <td style="width: 5%; vertical-align: top;;text-align:left;">(3)</td> <td style="vertical-align: top;;text-align:left;"><div style="text-align: left; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; line-height: normal;">This figure includes a leverage ratio buffer required to be met at 50% of the additional loss absorbency requirements applied to the Group as a <div style="white-space: nowrap; letter-spacing: 0px; top: 0px;;display:inline;">G-SIB</div> under the finalized Basel III reforms. </div></td></tr></table>
CY2022	mfg	Capital Conservation Buffer Percentage CapitalConservationBufferPercentage	0.025
CY2023	mfg	Capital Conservation Buffer Percentage CapitalConservationBufferPercentage	0.025
CY2023Q1	mfg	Japan Gaap Capital Required For Capital Adequacy To Risk Weighted Assets JapanGaapCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	1.20
CY2023	mfg	Japan Gaap Description Of Possible Effects Of Non Compliance Or Less Than Adequately Capitalized JapanGaapDescriptionOfPossibleEffectsOfNonComplianceOrLessThanAdequatelyCapitalized	A capital ratio of less than 140% will call for regulatory reporting and a capital ratio of less than 100% may lead to a temporary suspension of all or part of the business operations and further, to the cancellation of the license to act as a securities broker and dealer.
CY2021	us-gaap	Net Income Loss NetIncomeLoss	581765000000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	-104722000000
CY2023	us-gaap	Net Income Loss NetIncomeLoss	-14009000000
CY2021	us-gaap	Dilutive Securities DilutiveSecurities	0
CY2022	us-gaap	Dilutive Securities DilutiveSecurities	0
CY2023	us-gaap	Dilutive Securities DilutiveSecurities	0
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	581765000000
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-104722000000
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-14009000000
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	2537513000
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	2537051000
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	2536596000
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	89000
CY2022	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0
CY2023	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	2537602000
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	2537051000
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	2536596000
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	229.27
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-41.28
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-5.52
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	229.26
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-41.28
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-5.52
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	81023000000
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	42401000000
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	22015000000
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	78992000000
CY2022	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	71947000000
CY2023	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	156969000000
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	160015000000
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	114348000000
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	178984000000
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	55927000000
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-256093000000
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-146721000000
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-5226000000
CY2022	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	728000000
CY2023	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	2879000000
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	50701000000
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-255365000000
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-143842000000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	210716000000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-141017000000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	35142000000
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-2810000000
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-16489000000
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-4276000000
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-7195000000
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-8504000000
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-305000000
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	4385000000
CY2022	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-7985000000
CY2023	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-3971000000
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	143653000000
CY2022	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-9020000000
CY2023	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	37661000000
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	1424000000
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	7748000000
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	7848000000
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-142229000000
CY2022	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	16768000000
CY2023	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-29813000000
CY2021	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodTax	919000000
CY2022	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodTax	1745000000
CY2023	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Unrealized Gain Loss Arising During Period Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodTax	5630000000
CY2021	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Reclassification Adjustment From Aoci For Derecognition Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionReclassificationAdjustmentFromAociForDerecognitionTax	-1911000000
CY2022	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Reclassification Adjustment From Aoci For Derecognition Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionReclassificationAdjustmentFromAociForDerecognitionTax	271000000
CY2023	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option Reclassification Adjustment From Aoci For Derecognition Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionReclassificationAdjustmentFromAociForDerecognitionTax	334000000
CY2021	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option After Reclassification Adjustment Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionAfterReclassificationAdjustmentTax	-992000000
CY2022	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option After Reclassification Adjustment Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionAfterReclassificationAdjustmentTax	2016000000
CY2023	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option After Reclassification Adjustment Tax OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionAfterReclassificationAdjustmentTax	5964000000
CY2021	us-gaap	Income Tax Effects Allocated Directly To Equity IncomeTaxEffectsAllocatedDirectlyToEquity	145622000000
CY2022	us-gaap	Income Tax Effects Allocated Directly To Equity IncomeTaxEffectsAllocatedDirectlyToEquity	-22737000000
CY2023	us-gaap	Income Tax Effects Allocated Directly To Equity IncomeTaxEffectsAllocatedDirectlyToEquity	31806000000
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.3062
CY2022	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.3062
CY2023	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.3062
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	-0.0072
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.0421
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	-0.1423
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.0007
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	-0.0034
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.0163
CY2021	mfg	Effective Income Tax Rate Reconciliation Tax Rate Differentials EffectiveIncomeTaxRateReconciliationTaxRateDifferentials	-0.009
CY2022	mfg	Effective Income Tax Rate Reconciliation Tax Rate Differentials EffectiveIncomeTaxRateReconciliationTaxRateDifferentials	0.0331
CY2023	mfg	Effective Income Tax Rate Reconciliation Tax Rate Differentials EffectiveIncomeTaxRateReconciliationTaxRateDifferentials	-0.1295
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.0383
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.0668
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.0595
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CY2023Q1	mfg	Derivative Assets Gross Amounts Not Offset In Balance Sheet Cash Collaterals DerivativeAssetsGrossAmountsNotOffsetInBalanceSheetCashCollaterals	821000000000
CY2023Q1	mfg	Derivative Assets Net Amounts Offset Against Collaterals DerivativeAssetsNetAmountsOffsetAgainstCollaterals	1635000000000
CY2023Q1	mfg	Receivables Under Resale Agreements Gross Amounts Of Recognized Assets Liabilities ReceivablesUnderResaleAgreementsGrossAmountsOfRecognizedAssetsLiabilities	11695000000000
CY2023Q1	us-gaap	Securities Purchased Under Agreements To Resell Liability SecuritiesPurchasedUnderAgreementsToResellLiability	0
CY2023Q1	mfg	Receivables Under Resale Agreements Net Amounts ReceivablesUnderResaleAgreementsNetAmounts	11695000000000
CY2023Q1	mfg	Receivables Under Resale Agreements Gross Amounts Not Offset In Balance Sheet Financial Instruments ReceivablesUnderResaleAgreementsGrossAmountsNotOffsetInBalanceSheetFinancialInstruments	10565000000000
CY2023Q1	mfg	Receivables Under Resale Agreements Gross Amounts Not Offset In Balance Sheet Cash Collateral ReceivablesUnderResaleAgreementsGrossAmountsNotOffsetInBalanceSheetCashCollateral	0
CY2023Q1	mfg	Receivables Under Resale Agreements Net Amounts Offset Against Collaterals ReceivablesUnderResaleAgreementsNetAmountsOffsetAgainstCollaterals	1130000000000
CY2023Q1	mfg	Receivables Under Securities Borrowing Transactions Gross Amounts Of Recognized Assets Liabilities ReceivablesUnderSecuritiesBorrowingTransactionsGrossAmountsOfRecognizedAssetsLiabilities	1892000000000
CY2023Q1	us-gaap	Securities Borrowed Liability SecuritiesBorrowedLiability	0
CY2023Q1	mfg	Receivables Under Securities Borrowing Transactions Net Amounts ReceivablesUnderSecuritiesBorrowingTransactionsNetAmounts	1892000000000
CY2023Q1	mfg	Receivables Under Securities Borrowing Transactions Gross Amounts Not Offset In Balance Sheet Financial Instruments ReceivablesUnderSecuritiesBorrowingTransactionsGrossAmountsNotOffsetInBalanceSheetFinancialInstruments	1866000000000
CY2023Q1	mfg	Receivables Under Securities Borrowing Transactions Gross Amounts Not Offset In Balance Sheet Cash Collaterals ReceivablesUnderSecuritiesBorrowingTransactionsGrossAmountsNotOffsetInBalanceSheetCashCollaterals	0
CY2023Q1	mfg	Receivables Under Securities Borrowing Transactions Net Amounts Offset Against Collaterals ReceivablesUnderSecuritiesBorrowingTransactionsNetAmountsOffsetAgainstCollaterals	26000000000
CY2023Q1	mfg	Financial Assets Gross Amounts Of Recognized Assets Liabilities FinancialAssetsGrossAmountsOfRecognizedAssetsLiabilities	26519000000000
CY2023Q1	us-gaap	Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Liability DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability	0
CY2023Q1	mfg	Financial Assets Net Amounts FinancialAssetsNetAmounts	26519000000000
CY2023Q1	mfg	Financial Assets Gross Amounts Not Offset In Balance Sheet Financial Instruments FinancialAssetsGrossAmountsNotOffsetInBalanceSheetFinancialInstruments	22907000000000
CY2023Q1	mfg	Financial Assets Gross Amounts Not Offset In Balance Sheet Cash Collaterals FinancialAssetsGrossAmountsNotOffsetInBalanceSheetCashCollaterals	821000000000
CY2023Q1	mfg	Financial Assets Net Amounts Offset Against Collaterals FinancialAssetsNetAmountsOffsetAgainstCollaterals	2791000000000
CY2023Q1	mfg	Derivative Liabilities Gross Amounts Of Recognized Assets Liabilities DerivativeLiabilitiesGrossAmountsOfRecognizedAssetsLiabilities	12896000000000
CY2023Q1	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	0
CY2023Q1	mfg	Derivative Liabilities Net Amounts DerivativeLiabilitiesNetAmounts	12896000000000
CY2023Q1	mfg	Derivative Liabilities Gross Amounts Not Offset In Balance Sheet Financial Instruments DerivativeLiabilitiesGrossAmountsNotOffsetInBalanceSheetFinancialInstruments	10141000000000
CY2023Q1	mfg	Derivative Liabilities Gross Amounts Not Offset In Balance Sheet Cash Collaterals DerivativeLiabilitiesGrossAmountsNotOffsetInBalanceSheetCashCollaterals	843000000000
CY2023Q1	mfg	Derivative Liabilities Net Amounts Offset Against Collaterals DerivativeLiabilitiesNetAmountsOffsetAgainstCollaterals	1912000000000
CY2023Q1	mfg	Payables Under Repurchase Agreements Gross Amounts Of Recognized Assets Liabilities PayablesUnderRepurchaseAgreementsGrossAmountsOfRecognizedAssetsLiabilities	25737000000000
CY2023Q1	us-gaap	Securities Sold Under Agreements To Repurchase Asset SecuritiesSoldUnderAgreementsToRepurchaseAsset	0
CY2023Q1	mfg	Payables Under Repurchase Agreements Net Amounts PayablesUnderRepurchaseAgreementsNetAmounts	25737000000000
CY2023Q1	mfg	Payables Under Repurchase Agreements Gross Amounts Not Offset In Balance Sheet Financial Instruments PayablesUnderRepurchaseAgreementsGrossAmountsNotOffsetInBalanceSheetFinancialInstruments	25113000000000
CY2023Q1	mfg	Payables Under Repurchase Agreements Gross Amounts Not Offset In Balance Sheet Cash Collaterals PayablesUnderRepurchaseAgreementsGrossAmountsNotOffsetInBalanceSheetCashCollaterals	0
CY2023Q1	mfg	Payables Under Repurchase Agreements Net Amounts Offset Against Collaterals PayablesUnderRepurchaseAgreementsNetAmountsOffsetAgainstCollaterals	624000000000
CY2023Q1	mfg	Payables Under Securities Lending Transactions Gross Amounts Of Recognized Assets Liabilities PayablesUnderSecuritiesLendingTransactionsGrossAmountsOfRecognizedAssetsLiabilities	886000000000
CY2023Q1	us-gaap	Securities Loaned Asset SecuritiesLoanedAsset	0
CY2023Q1	mfg	Payables Under Securities Lending Transactions Net Amounts PayablesUnderSecuritiesLendingTransactionsNetAmounts	886000000000
CY2023Q1	mfg	Payables Under Securities Lending Transactions Gross Amounts Not Offset In Balance Sheet Financial Instruments PayablesUnderSecuritiesLendingTransactionsGrossAmountsNotOffsetInBalanceSheetFinancialInstruments	755000000000
CY2023Q1	mfg	Payables Under Securities Lending Transactions Gross Amounts Not Offset In Balance Sheet Cash Collaterals PayablesUnderSecuritiesLendingTransactionsGrossAmountsNotOffsetInBalanceSheetCashCollaterals	0
CY2023Q1	mfg	Payables Under Securities Lending Transactions Net Amounts Offset Against Collaterals PayablesUnderSecuritiesLendingTransactionsNetAmountsOffsetAgainstCollaterals	131000000000
CY2023Q1	mfg	Financial Liabilities Gross Amounts Of Recognized Assets Liabilities FinancialLiabilitiesGrossAmountsOfRecognizedAssetsLiabilities	39519000000000
CY2023Q1	us-gaap	Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Asset DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset	0
CY2023Q1	mfg	Financial Liabilities Net Amounts FinancialLiabilitiesNetAmounts	39519000000000
CY2023Q1	mfg	Financial Liabilities Gross Amounts Not Offset In Balance Sheet Financial Instruments FinancialLiabilitiesGrossAmountsNotOffsetInBalanceSheetFinancialInstruments	36009000000000
CY2023Q1	mfg	Financial Liabilities Gross Amounts Not Offset In Balance Sheet Cash Collaterals FinancialLiabilitiesGrossAmountsNotOffsetInBalanceSheetCashCollaterals	843000000000
CY2023Q1	mfg	Financial Liabilities Net Amounts Offset Against Collaterals FinancialLiabilitiesNetAmountsOffsetAgainstCollaterals	2667000000000
CY2022Q1	mfg	Receivables Under Resale Agreement Subject To Enforceable Master Netting Arragements ReceivablesUnderResaleAgreementSubjectToEnforceableMasterNettingArragements	11537000000000
CY2022Q1	mfg	Payables Under Repurchase Agreement Subject To Enforceable Master Netting Arragement PayablesUnderRepurchaseAgreementSubjectToEnforceableMasterNettingArragement	19505000000000
CY2023Q1	mfg	Receivables Under Resale Agreement Subject To Enforceable Master Netting Arragements ReceivablesUnderResaleAgreementSubjectToEnforceableMasterNettingArragements	10587000000000
CY2023Q1	mfg	Payables Under Repurchase Agreement Subject To Enforceable Master Netting Arragement PayablesUnderRepurchaseAgreementSubjectToEnforceableMasterNettingArragement	25147000000000
CY2022Q1	mfg	Receivables Under Securities Borrowing Transaction Subject To Master Netting Arrangement ReceivablesUnderSecuritiesBorrowingTransactionSubjectToMasterNettingArrangement	2339000000000
CY2022Q1	mfg	Payables Under Securities Lending Transaction Subject To Master Netting Arragement PayablesUnderSecuritiesLendingTransactionSubjectToMasterNettingArragement	1172000000000
CY2023Q1	mfg	Receivables Under Securities Borrowing Transaction Subject To Master Netting Arrangement ReceivablesUnderSecuritiesBorrowingTransactionSubjectToMasterNettingArrangement	1892000000000
CY2023Q1	mfg	Payables Under Securities Lending Transaction Subject To Master Netting Arragement PayablesUnderSecuritiesLendingTransactionSubjectToMasterNettingArragement	758000000000
CY2022Q1	us-gaap	Financial Assets Sold Under Agreements To Repurchase Gross Including Not Subject To Master Netting Arrangement FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	20070000000000
CY2022Q1	us-gaap	Securities Loaned Including Not Subject To Master Netting Arrangement And Assets Other Than Securities Transferred SecuritiesLoanedIncludingNotSubjectToMasterNettingArrangementAndAssetsOtherThanSecuritiesTransferred	1361000000000
CY2022Q1	us-gaap	Secured Borrowings Gross Including Not Subject To Master Netting Arrangement SecuredBorrowingsGrossIncludingNotSubjectToMasterNettingArrangement	21431000000000
CY2023Q1	us-gaap	Financial Assets Sold Under Agreements To Repurchase Gross Including Not Subject To Master Netting Arrangement FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	25737000000000
CY2023Q1	us-gaap	Securities Loaned Including Not Subject To Master Netting Arrangement And Assets Other Than Securities Transferred SecuritiesLoanedIncludingNotSubjectToMasterNettingArrangementAndAssetsOtherThanSecuritiesTransferred	886000000000
CY2023Q1	us-gaap	Secured Borrowings Gross Including Not Subject To Master Netting Arrangement SecuredBorrowingsGrossIncludingNotSubjectToMasterNettingArrangement	26623000000000
CY2022Q1	us-gaap	Financial Assets Sold Under Agreements To Repurchase Gross Including Not Subject To Master Netting Arrangement FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	20070000000000
CY2022Q1	us-gaap	Securities Loaned Including Not Subject To Master Netting Arrangement And Assets Other Than Securities Transferred SecuritiesLoanedIncludingNotSubjectToMasterNettingArrangementAndAssetsOtherThanSecuritiesTransferred	1361000000000
CY2023Q1	us-gaap	Financial Assets Sold Under Agreements To Repurchase Gross Including Not Subject To Master Netting Arrangement FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	25737000000000
CY2023Q1	us-gaap	Securities Loaned Including Not Subject To Master Netting Arrangement And Assets Other Than Securities Transferred SecuritiesLoanedIncludingNotSubjectToMasterNettingArrangementAndAssetsOtherThanSecuritiesTransferred	886000000000
CY2023	mfg	Related Party Transactions RelatedPartyTransactions	<div style="font-family: "Times New Roman"; font-size: 10pt; margin-top: 18pt; margin-bottom: 0pt;"><div style="font-weight:bold;display:inline;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">29. Related party transactions </div></div></div> <div style="font-family: Times New Roman; font-size: 10pt; margin-top: 6pt; margin-bottom: 0pt;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">The banking subsidiaries of MHFG make loans to the MHFG Group’s directors, executive officers, and other related parties. At March 31, 2022 and 2023, the aggregate loans to the Group’s equity method investees amounted to ¥604 billion and ¥732 billion, respectively, and outstanding loans to MHFG Group’s directors, executive officers, and other related parties were not considered significant. There were no loans to related parties that were considered nonaccrual. During the fiscal years ended March 31, 2022 and 2023, certain subsidiaries of MHFG partially withdrew assets from employee retirement benefit trusts, which were established for the payment of employees’ severance pay and retirement pensions. See Note 20 “Pension and other employee benefit plans” for further details. In addition, the other transactions with the related parties excluding loan transactions and partial withdrawal of assets from employee retirement benefit trusts, are considered immaterial. </div></div> <div style="font-size: 8pt; margin-top: 0pt; margin-bottom: 0pt;"><div style="font-size: 8pt; letter-spacing: 0px; top: 0px;;display:inline;"> </div></div> <div style="text-align: center; font-family: Times New Roman; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;"></div></div> <div style="font-family: Times New Roman; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt;"><div style="font-style: normal; letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-style:italic;display:inline;">Summarized Financial Information of the MHFG Group’s Equity Method Investees </div></div></div> <div style="font-family: Times New Roman; font-size: 10pt; margin-top: 6pt; margin-bottom: 0pt;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Summarized financial information of the MHFG Group’s equity method investees as of March 31, 2022 and 2023, and for each of the three years ended March 31, 2023, is as follows: </div></div> <div style="font-size: 12pt; letter-spacing: 0px; top: 0px;;display:inline;"></div> <div style="font-size: 12pt; margin-top: 0pt; margin-bottom: 0pt;;text-indent: 0px;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-size: 12pt; letter-spacing: 0px; top: 0px;;display:inline;"> </div></div></div> <table cellpadding="0" cellspacing="0" style="margin: 0px auto; border: 0px currentcolor; width: 100%; font-family: "Times New Roman"; font-size: 10pt; border-collapse: collapse; border-spacing: 0px;;text-indent: 0px;"> <tr style="font-size: 0px;"> <td style="width: 82%;"></td> <td style="width: 3%; vertical-align: bottom;"></td> <td></td> <td></td> <td></td> <td style="width: 3%; vertical-align: bottom;"></td> <td></td> <td></td> <td></td> </tr> <tr style="font-family: Times New Roman; font-size: 8pt; page-break-inside: avoid;"> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td colspan="2" style="vertical-align: bottom; border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1pt; border-bottom-style: solid;;text-align:center;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-weight:bold;display:inline;">2022</div></div></div></td> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td colspan="2" style="vertical-align: bottom; border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1pt; border-bottom-style: solid;;text-align:center;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-weight:bold;display:inline;">2023</div></div></div></td> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> </tr> <tr style="font-family: Times New Roman; font-size: 1pt; page-break-inside: avoid;"> <td style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td colspan="2" style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td colspan="2" style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> </tr> <tr style="font-family: Times New Roman; font-size: 8pt; page-break-inside: avoid;"> <td style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td colspan="6" style="vertical-align: bottom;;text-align:center;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-weight:bold;display:inline;">(in billions of yen)</div></div></div></td> <td style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> </tr> <tr style="font-family: Times New Roman; font-size: 10pt; page-break-inside: avoid; background-color: rgb(204, 238, 255);"> <td style="vertical-align: top;"> <div style="text-indent: -1em; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 1em; line-height: normal;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Loans</div></div> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">7,765</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">6,037</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> </tr> <tr style="font-family: Times New Roman; font-size: 10pt; page-break-inside: avoid;"> <td style="vertical-align: top;"> <div style="text-indent: -1em; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 1em; line-height: normal;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Total assets</div></div> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">30,180</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">29,367</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> </tr> <tr style="font-family: Times New Roman; font-size: 10pt; page-break-inside: avoid; background-color: rgb(204, 238, 255);"> <td style="vertical-align: top;"> <div style="text-indent: -1em; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 1em; line-height: normal;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Deposits</div></div> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">8,713</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">6,216</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> </tr> <tr style="font-family: Times New Roman; font-size: 10pt; page-break-inside: avoid;"> <td style="vertical-align: top;"> <div style="text-indent: -1em; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 1em; line-height: normal;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Total liabilities</div></div> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">27,474</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">26,506</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> </tr> <tr style="font-family: Times New Roman; font-size: 10pt; page-break-inside: avoid; background-color: rgb(204, 238, 255);"> <td style="vertical-align: top;"> <div style="text-indent: -1em; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 1em; line-height: normal;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Total equity</div></div> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">2,706</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">2,861</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> </tr> <tr style="font-family: Times New Roman; font-size: 10pt; page-break-inside: avoid;"> <td style="vertical-align: top;"> <div style="text-indent: -1em; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 1em; line-height: normal;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Noncontrolling interests</div></div> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">14</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">16</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> </tr> </table> <div style="clear:both;max-height:0pt;;text-indent: 0px;"></div> <div style="clear: both; max-height: 0px;"></div> <div style="font-size: 12pt; letter-spacing: 0px; top: 0px;;display:inline;"></div><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-size: 12pt; letter-spacing: 0px; top: 0px;;display:inline;"></div></div> <div style="font-size: 12pt; margin-top: 0pt; margin-bottom: 0pt;;text-indent: 0px;"><br/></div> <div style="clear:both;max-height:0pt;;text-indent: 0px;"></div> <table cellpadding="0" cellspacing="0" style="margin: 0px auto; border: 0px currentcolor; width: 100%; font-family: "Times New Roman"; font-size: 10pt; border-collapse: collapse; border-spacing: 0px;;text-indent: 0px;"> <tr style="font-size: 0px;"> <td style="width: 73%;"></td> <td style="width: 6%; vertical-align: bottom;"></td> <td></td> <td></td> <td></td> <td style="width: 6%; vertical-align: bottom;"></td> <td></td> <td></td> <td></td> <td style="width: 6%; vertical-align: bottom;"></td> <td></td> <td></td> <td></td> </tr> <tr style="font-family: Times New Roman; font-size: 8pt; page-break-inside: avoid;"> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td colspan="2" style="vertical-align: bottom; border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1pt; border-bottom-style: solid;;text-align:center;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-weight:bold;display:inline;">2021</div></div></div></td> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td colspan="2" style="vertical-align: bottom; border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1pt; border-bottom-style: solid;;text-align:center;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-weight:bold;display:inline;">2022</div></div></div></td> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td colspan="2" style="vertical-align: bottom; border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1pt; border-bottom-style: solid;;text-align:center;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-weight:bold;display:inline;">2023</div></div></div></td> <td style="vertical-align: bottom; padding-bottom: 0.5pt;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> </tr> <tr style="font-family: Times New Roman; font-size: 1pt; page-break-inside: avoid;"> <td style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td colspan="2" style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td colspan="2" style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td colspan="2" style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> </tr> <tr style="font-family: Times New Roman; font-size: 8pt; page-break-inside: avoid;"> <td style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> <td colspan="10" style="vertical-align: bottom;;text-align:center;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-weight:bold;display:inline;">(in billions of yen)</div></div></div></td> <td style="vertical-align: bottom;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"> </div></td> </tr> <tr style="font-family: Times New Roman; font-size: 10pt; page-break-inside: avoid; background-color: rgb(204, 238, 255);"> <td style="vertical-align: top;"> <div style="text-indent: -1em; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 1em; line-height: normal;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Total interest and dividend income</div></div> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">570</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">625</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;"> 750</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> </tr> <tr style="font-family: Times New Roman; font-size: 10pt; page-break-inside: avoid;"> <td style="vertical-align: top;"> <div style="text-indent: -1em; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 1em; line-height: normal;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Total interest expense</div></div> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">188</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">182</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">239</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> </tr> <tr style="font-family: Times New Roman; font-size: 10pt; page-break-inside: avoid; background-color: rgb(204, 238, 255);"> <td style="vertical-align: top;"> <div style="text-indent: -1em; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 1em; line-height: normal;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Provision (credit) for credit losses</div></div> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">91</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">104</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">96</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> </tr> <tr style="font-family: Times New Roman; font-size: 10pt; page-break-inside: avoid;"> <td style="vertical-align: top;"> <div style="text-indent: -1em; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 1em; line-height: normal;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Net interest income after provision (credit) for credit losses</div></div> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">291</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">339</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">415</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> </tr> <tr style="font-family: Times New Roman; font-size: 10pt; page-break-inside: avoid; background-color: rgb(204, 238, 255);"> <td style="vertical-align: top;"> <div style="text-indent: -1em; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 1em; line-height: normal;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Income before income tax expense</div></div> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">237</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">332</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">261</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> </tr> <tr style="font-family: Times New Roman; font-size: 10pt; page-break-inside: avoid;"> <td style="vertical-align: top;"> <div style="text-indent: -1em; font-family: "Times New Roman"; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 1em; line-height: normal;"><div style="font-family: "Times New Roman"; font-size: 10pt; letter-spacing: 0px; top: 0px;;display:inline;">Net income</div></div> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">178</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">246</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom;"> </td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> <td style="vertical-align: bottom; white-space: nowrap;;text-align:right;">194</td> <td style="vertical-align: bottom; white-space: nowrap;"> </td> </tr> </table> <div style="clear:both;max-height:0pt;;text-indent: 0px;"></div>
CY2022Q1	us-gaap	Due From Related Parties DueFromRelatedParties	604000000000
CY2023Q1	us-gaap	Due From Related Parties DueFromRelatedParties	732000000000
CY2023	mfg	Number Of Loans To Related Parties Impaired NumberOfLoansToRelatedPartiesImpaired	0
CY2022	mfg	Number Of Loans To Related Parties Impaired NumberOfLoansToRelatedPartiesImpaired	0
CY2023	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	5
CY2021	mfg	Japan Gaap Gross Profit JapanGaapGrossProfit	2200800000000
CY2021	mfg	Japan Gaap General And Administrative Expense JapanGaapGeneralAndAdministrativeExpense	1408700000000
CY2021	mfg	Japan Gaap Equity In Earnings Losses Of Equity Method Investees Net JapanGaapEquityInEarningsLossesOfEquityMethodInvesteesNet	19900000000
CY2021	mfg	Japan Gaap Amortization Of Goodwill And Others JapanGaapAmortizationOfGoodwillAndOthers	12200000000
CY2021	mfg	Japan Gaap Segment Operating Profit Loss JapanGaapSegmentOperatingProfitLoss	799800000000
CY2021	mfg	Japan Gaap Fixed Assets JapanGaapFixedAssets	1755700000000
CY2022	mfg	Japan Gaap Gross Profit JapanGaapGrossProfit	2254500000000
CY2022	mfg	Japan Gaap General And Administrative Expense JapanGaapGeneralAndAdministrativeExpense	1415000000000
CY2022	mfg	Japan Gaap Equity In Earnings Losses Of Equity Method Investees Net JapanGaapEquityInEarningsLossesOfEquityMethodInvesteesNet	25400000000
CY2022	mfg	Japan Gaap Amortization Of Goodwill And Others JapanGaapAmortizationOfGoodwillAndOthers	11700000000
CY2022	mfg	Japan Gaap Segment Operating Profit Loss JapanGaapSegmentOperatingProfitLoss	853200000000
CY2022	mfg	Japan Gaap Fixed Assets JapanGaapFixedAssets	1697300000000
CY2023	mfg	Japan Gaap Gross Profit JapanGaapGrossProfit	2280200000000
CY2023	mfg	Japan Gaap General And Administrative Expense JapanGaapGeneralAndAdministrativeExpense	1473600000000
CY2023	mfg	Japan Gaap Equity In Earnings Losses Of Equity Method Investees Net JapanGaapEquityInEarningsLossesOfEquityMethodInvesteesNet	11900000000
CY2023	mfg	Japan Gaap Amortization Of Goodwill And Others JapanGaapAmortizationOfGoodwillAndOthers	11400000000
CY2023	mfg	Japan Gaap Segment Operating Profit Loss JapanGaapSegmentOperatingProfitLoss	807100000000
CY2023	mfg	Japan Gaap Fixed Assets JapanGaapFixedAssets	1678600000000
CY2021	mfg	Japan Gaap Segment Reporting Segment Operating Profit Loss JapanGaapSegmentReportingSegmentOperatingProfitLoss	799800000000
CY2022	mfg	Japan Gaap Segment Reporting Segment Operating Profit Loss JapanGaapSegmentReportingSegmentOperatingProfitLoss	853200000000
CY2023	mfg	Japan Gaap Segment Reporting Segment Operating Profit Loss JapanGaapSegmentReportingSegmentOperatingProfitLoss	807100000000
CY2021	mfg	Japan Gaap General And Administrative Expenses Non Recurring Losses JapanGaapGeneralAndAdministrativeExpensesNonRecurringLosses	-6300000000
CY2022	mfg	Japan Gaap General And Administrative Expenses Non Recurring Losses JapanGaapGeneralAndAdministrativeExpensesNonRecurringLosses	-33700000000
CY2023	mfg	Japan Gaap General And Administrative Expenses Non Recurring Losses JapanGaapGeneralAndAdministrativeExpensesNonRecurringLosses	-39700000000
CY2021	mfg	Japan Gaap Expenses Related To Portfolio Problems Including Reversal Of Provision For General Reserve JapanGaapExpensesRelatedToPortfolioProblemsIncludingReversalOfProvisionForGeneralReserve	209900000000
CY2022	mfg	Japan Gaap Expenses Related To Portfolio Problems Including Reversal Of Provision For General Reserve JapanGaapExpensesRelatedToPortfolioProblemsIncludingReversalOfProvisionForGeneralReserve	255900000000
CY2023	mfg	Japan Gaap Expenses Related To Portfolio Problems Including Reversal Of Provision For General Reserve JapanGaapExpensesRelatedToPortfolioProblemsIncludingReversalOfProvisionForGeneralReserve	96700000000
CY2021	mfg	Japan Gaap Gains On Reversal Of Reserves For Possible Losses On Loans And Others JapanGaapGainsOnReversalOfReservesForPossibleLossesOnLoansAndOthers	4900000000
CY2022	mfg	Japan Gaap Gains On Reversal Of Reserves For Possible Losses On Loans And Others JapanGaapGainsOnReversalOfReservesForPossibleLossesOnLoansAndOthers	20800000000
CY2023	mfg	Japan Gaap Gains On Reversal Of Reserves For Possible Losses On Loans And Others JapanGaapGainsOnReversalOfReservesForPossibleLossesOnLoansAndOthers	7400000000
CY2021	mfg	Japan Gaap Gain Loss On Exchange Traded Fund And Others JapanGaapGainLossOnExchangeTradedFundAndOthers	-10100000000
CY2022	mfg	Japan Gaap Gain Loss On Exchange Traded Fund And Others JapanGaapGainLossOnExchangeTradedFundAndOthers	45800000000
CY2023	mfg	Japan Gaap Gain Loss On Exchange Traded Fund And Others JapanGaapGainLossOnExchangeTradedFundAndOthers	-84600000000
CY2021	mfg	Japan Gaap Net Extraordinary Gains Losses JapanGaapNetExtraordinaryGainsLosses	115900000000
CY2022	mfg	Japan Gaap Net Extraordinary Gains Losses JapanGaapNetExtraordinaryGainsLosses	44000000000
CY2023	mfg	Japan Gaap Net Extraordinary Gains Losses JapanGaapNetExtraordinaryGainsLosses	-10600000000
CY2021	mfg	Japan Gaap Others JapanGaapOthers	74900000000
CY2022	mfg	Japan Gaap Others JapanGaapOthers	46100000000
CY2023	mfg	Japan Gaap Others JapanGaapOthers	52500000000
CY2021	mfg	Japan Gaap Income Before Income Tax Expense JapanGaapIncomeBeforeIncomeTaxExpense	652200000000
CY2022	mfg	Japan Gaap Income Before Income Tax Expense JapanGaapIncomeBeforeIncomeTaxExpense	603900000000
CY2023	mfg	Japan Gaap Income Before Income Tax Expense JapanGaapIncomeBeforeIncomeTaxExpense	779000000000
CY2021	mfg	Adjustment For Derivative Financial Instruments And Hedging Activities AdjustmentForDerivativeFinancialInstrumentsAndHedgingActivities	-86400000000
CY2022	mfg	Adjustment For Derivative Financial Instruments And Hedging Activities AdjustmentForDerivativeFinancialInstrumentsAndHedgingActivities	-124000000000
CY2023	mfg	Adjustment For Derivative Financial Instruments And Hedging Activities AdjustmentForDerivativeFinancialInstrumentsAndHedgingActivities	-373200000000
CY2021	mfg	Adjustment For Investments AdjustmentForInvestments	523500000000
CY2022	mfg	Adjustment For Investments AdjustmentForInvestments	-600100000000
CY2023	mfg	Adjustment For Investments AdjustmentForInvestments	-210500000000
CY2021	mfg	Adjustment For Loans AdjustmentForLoans	-16900000000
CY2022	mfg	Adjustment For Loans AdjustmentForLoans	-18300000000
CY2023	mfg	Adjustment For Loans AdjustmentForLoans	-30300000000
CY2021	mfg	Adjustment For Allowances For Loan Losses And Offbalancesheet Instruments AdjustmentForAllowancesForLoanLossesAndOffbalancesheetInstruments	83300000000
CY2022	mfg	Adjustment For Allowances For Loan Losses And Offbalancesheet Instruments AdjustmentForAllowancesForLoanLossesAndOffbalancesheetInstruments	51500000000
CY2023	mfg	Adjustment For Allowances For Loan Losses And Offbalancesheet Instruments AdjustmentForAllowancesForLoanLossesAndOffbalancesheetInstruments	-9800000000
CY2021	mfg	Adjustment For Premises And Equipment AdjustmentForPremisesAndEquipment	-56500000000
CY2022	mfg	Adjustment For Premises And Equipment AdjustmentForPremisesAndEquipment	-68500000000
CY2023	mfg	Adjustment For Premises And Equipment AdjustmentForPremisesAndEquipment	-29300000000
CY2021	mfg	Adjustment For Land Revaluation AdjustmentForLandRevaluation	6400000000
CY2022	mfg	Adjustment For Land Revaluation AdjustmentForLandRevaluation	6400000000
CY2023	mfg	Adjustment For Land Revaluation AdjustmentForLandRevaluation	5600000000
CY2021	mfg	Adjustment For Business Combinations AdjustmentForBusinessCombinations	-1000000000
CY2022	mfg	Adjustment For Business Combinations AdjustmentForBusinessCombinations	6900000000
CY2023	mfg	Adjustment For Business Combinations AdjustmentForBusinessCombinations	8900000000
CY2021	mfg	Adjustment For Pension Liabilities AdjustmentForPensionLiabilities	-153200000000
CY2022	mfg	Adjustment For Pension Liabilities AdjustmentForPensionLiabilities	-94400000000
CY2023	mfg	Adjustment For Pension Liabilities AdjustmentForPensionLiabilities	-71600000000
CY2021	mfg	Adjustment For Consolidation Of Variable Interest Entities AdjustmentForConsolidationOfVariableInterestEntities	104600000000
CY2022	mfg	Adjustment For Consolidation Of Variable Interest Entities AdjustmentForConsolidationOfVariableInterestEntities	42300000000
CY2023	mfg	Adjustment For Consolidation Of Variable Interest Entities AdjustmentForConsolidationOfVariableInterestEntities	800000000
CY2021	mfg	Adjustment For Foreign Currency Translation AdjustmentForForeignCurrencyTranslation	-31500000000
CY2022	mfg	Adjustment For Foreign Currency Translation AdjustmentForForeignCurrencyTranslation	-51000000000
CY2023	mfg	Adjustment For Foreign Currency Translation AdjustmentForForeignCurrencyTranslation	-5200000000
CY2021	mfg	Other Adjustments OtherAdjustments	4300000000
CY2022	mfg	Other Adjustments OtherAdjustments	2800000000
CY2023	mfg	Other Adjustments OtherAdjustments	4800000000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1028800000000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-242500000000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	69200000000
CY2021	mfg	Japan Gaap Fixed Assets JapanGaapFixedAssets	1755700000000
CY2022	mfg	Japan Gaap Fixed Assets JapanGaapFixedAssets	1697300000000
CY2023	mfg	Japan Gaap Fixed Assets JapanGaapFixedAssets	1678600000000
CY2021Q1	mfg	Statutory Accounting Practices Statutory To Other Gaap Adjustments Amount Of Reconciling Item StatutoryAccountingPracticesStatutoryToOtherGaapAdjustmentsAmountOfReconcilingItem	816100000000
CY2022Q1	mfg	Statutory Accounting Practices Statutory To Other Gaap Adjustments Amount Of Reconciling Item StatutoryAccountingPracticesStatutoryToOtherGaapAdjustmentsAmountOfReconcilingItem	717600000000
CY2023Q1	mfg	Statutory Accounting Practices Statutory To Other Gaap Adjustments Amount Of Reconciling Item StatutoryAccountingPracticesStatutoryToOtherGaapAdjustmentsAmountOfReconcilingItem	662600000000
CY2021	mfg	Japan Gaap Premises And Equipment Net Goodwill And Intangible Assets JapanGaapPremisesAndEquipmentNetGoodwillAndIntangibleAssets	2571800000000
CY2022	mfg	Japan Gaap Premises And Equipment Net Goodwill And Intangible Assets JapanGaapPremisesAndEquipmentNetGoodwillAndIntangibleAssets	2414900000000
CY2023	mfg	Japan Gaap Premises And Equipment Net Goodwill And Intangible Assets JapanGaapPremisesAndEquipmentNetGoodwillAndIntangibleAssets	2341200000000
CY2021	us-gaap	Revenues Revenues	3497900000000
CY2021	mfg	Total Expenses TotalExpenses	2469100000000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1028800000000
CY2021	us-gaap	Profit Loss ProfitLoss	818000000000
CY2021Q1	us-gaap	Assets Assets	221651500000000
CY2022	us-gaap	Revenues Revenues	2113700000000
CY2022	mfg	Total Expenses TotalExpenses	2356200000000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-242500000000
CY2022	us-gaap	Profit Loss ProfitLoss	-101500000000
CY2022Q1	us-gaap	Assets Assets	231550700000000
CY2023	us-gaap	Revenues Revenues	4276900000000
CY2023	mfg	Total Expenses TotalExpenses	4207700000000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	69200000000
CY2023	us-gaap	Profit Loss ProfitLoss	34000000000
CY2023Q1	us-gaap	Assets Assets	248780700000000

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d421865d20f.htm	Edgar Link	pending
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$MFG
MIZUHO FINANCIAL GROUP INC Stock $mfg

2023 Q1 Form 20-F Financial Statement

#000119312523176656 Filed on June 28, 2023

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MFG MIZUHO FINANCIAL GROUP INC Stock $mfg

2023 Q1 Form 20-F Financial Statement

#000119312523176656 Filed on June 28, 2023

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MFG
MIZUHO FINANCIAL GROUP INC Stock $mfg