$AEP
AMERICAN ELECTRIC POWER CO INC Stock $aep

$aep Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000000490421000010 Filed on February 25, 2021

Income Statement

Concept	2020 Q4	2020	2019 Q4
Revenue	$3.611B	$14.92B	$3.616B
YoY Change	-0.14%	-4.13%	-4.87%
Cost Of Revenue	$789.0M	$2.930B	$859.0M
YoY Change	-8.15%	-7.42%	-1.83%
Gross Profit	$2.822B	$11.99B	$2.757B
YoY Change	2.36%	-3.28%	-5.78%
Gross Profit Margin	78.15%	80.36%	76.24%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$706.8M	$2.488B	$658.4M
YoY Change	7.35%	12.88%	5.8%
% of Gross Profit	25.05%	20.75%	23.88%
Operating Expenses	$2.251B	$11.93B	$2.306B
YoY Change	-2.39%	-8.01%	0.09%
Operating Profit	$571.0M	$2.988B	$294.7M
YoY Change	93.76%	15.25%	-46.53%
Interest Expense	-$252.0M	$1.166B	-$245.0M
YoY Change	2.86%	8.69%	16.11%
% of Operating Profit	-44.13%	39.02%	-83.14%
Other Income/Expense, Net	$71.00M	$57.00M	$38.00M
YoY Change	86.84%	114.29%	31.03%
Pretax Income	$390.0M	$2.234B	$88.00M
YoY Change	343.18%	17.35%	-76.15%
Income Tax	$31.00M	$40.50M	-$44.00M
% Of Pretax Income	7.95%	1.81%	-50.0%
Net Earnings	$436.0M	$2.197B	$152.7M
YoY Change	185.53%	14.42%	-58.14%
Net Earnings / Revenue	12.07%	14.72%	4.22%
Basic Earnings Per Share		$4.44
Diluted Earnings Per Share	$875.5K	$4.42	$311.7K
COMMON SHARES
Basic Shares Outstanding	496.6M shares	495.7M shares	494.2M shares
Diluted Shares Outstanding		497.2M shares

Balance Sheet

Concept	2020 Q4	2020	2019 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$594.0M	$594.0M	$450.0M
YoY Change	32.0%	32.0%	14.5%
Cash & Equivalents	$392.7M	$393.0M	$246.8M
Short-Term Investments	$201.0M	$201.0M	$203.0M
Other Short-Term Assets	$669.0M	$669.0M	$976.0M
YoY Change	-31.45%	-31.45%	-9.88%
Inventory	$1.310B	$1.310B	$1.169B
Prepaid Expenses
Receivables	$1.843B	$1.561B	$1.705B
Other Receivables	$218.0M	$218.0M	$27.00M
Total Short-Term Assets	$4.352B	$4.352B	$4.078B
YoY Change	6.71%	6.72%	-0.88%
LONG-TERM ASSETS
Property, Plant & Equipment	$63.90B	$64.77B	$60.14B
YoY Change	6.26%	6.01%	9.15%
Goodwill	$52.50M		$52.50M
YoY Change	0.0%		0.0%
Intangibles
YoY Change
Long-Term Investments	$1.406B		$1.357B
YoY Change	3.66%		60.32%
Other Assets	$3.852B	$11.59B	$3.407B
YoY Change	13.06%	8.61%	32.2%
Total Long-Term Assets	$12.50B	$76.41B	$11.68B
YoY Change	7.09%	6.39%	21.76%
TOTAL ASSETS
Total Short-Term Assets	$4.352B	$4.352B	$4.078B
Total Long-Term Assets	$12.50B	$76.41B	$11.68B
Total Assets	$80.76B	$80.76B	$75.89B
YoY Change	6.41%	6.41%	10.3%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$1.710B	$1.710B	$2.086B
YoY Change	-18.03%	-18.02%	11.28%
Accrued Expenses	$509.0M	$509.0M	$478.0M
YoY Change	6.49%	6.49%	106.03%
Deferred Revenue
YoY Change
Short-Term Debt	$2.479B	$2.479B	$2.838B
YoY Change	-12.65%	-12.65%	48.6%
Long-Term Debt Due	$2.086B	$2.144B	$1.599B
YoY Change	30.49%	29.47%	-5.88%
Total Short-Term Liabilities	$9.927B	$9.927B	$10.30B
YoY Change	-3.62%	-3.61%	19.08%
LONG-TERM LIABILITIES
Long-Term Debt	$28.99B	$29.22B	$25.13B
YoY Change	15.36%	15.14%	16.07%
Other Long-Term Liabilities	$728.0M	$12.55B	$719.8M
YoY Change	1.14%	-0.43%	-8.02%
Total Long-Term Liabilities	$50.01B	$41.77B	$45.57B
YoY Change	9.74%	9.97%	11.19%
TOTAL LIABILITIES
Total Short-Term Liabilities	$9.927B	$9.927B	$10.30B
Total Long-Term Liabilities	$50.01B	$41.77B	$45.57B
Total Liabilities	$59.94B	$60.16B	$55.87B
YoY Change	7.28%	7.02%	12.56%
SHAREHOLDERS EQUITY
Retained Earnings	$10.69B		$9.901B
YoY Change	7.95%		6.17%
Common Stock	$3.359B		$3.343B
YoY Change	0.48%		0.18%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares	20.20M shares		20.20M shares
Shareholders Equity	$20.55B	$20.60B	$19.63B
YoY Change
Total Liabilities & Shareholders Equity	$80.76B	$80.76B	$75.89B
YoY Change	6.41%	6.41%	10.3%

Cashflow Statement

Concept	2020 Q4	2020	2019 Q4
OPERATING ACTIVITIES
Net Income	$436.0M	$2.197B	$152.7M
YoY Change	185.53%	14.42%	-58.14%
Depreciation, Depletion And Amortization	$706.8M	$2.488B	$658.4M
YoY Change	7.35%	12.88%	5.8%
Cash From Operating Activities	$910.7M	$3.833B	$920.2M
YoY Change	-1.03%	-10.24%	-28.7%
INVESTING ACTIVITIES
Capital Expenditures	-$1.557B	$0.00	-$1.716B
YoY Change	-9.24%	-100.0%	4.46%
Acquisitions
YoY Change
Other Investing Activities	$30.60M	-$116.6M	-$71.10M
YoY Change	-143.04%	-19533.33%	217.41%
Cash From Investing Activities	-$1.527B	-$6.234B	-$1.787B
YoY Change	-14.57%	-12.75%	7.33%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$155.0M
YoY Change		137.37%
Debt Paid & Issued, Net		$1.340B
YoY Change		9.75%
Cash From Financing Activities	590.4M	$2.407B	809.5M
YoY Change	-27.07%	-15.93%	-779.68%
NET CHANGE
Cash From Operating Activities	910.7M	$3.833B	920.2M
Cash From Investing Activities	-1.527B	-$6.234B	-1.787B
Cash From Financing Activities	590.4M	$2.407B	809.5M
Net Change In Cash	-25.50M	$5.700M	-57.20M
YoY Change	-55.42%	-149.57%	-88.41%
FREE CASH FLOW
Cash From Operating Activities	$910.7M	$3.833B	$920.2M
Capital Expenditures	-$1.557B	$0.00	-$1.716B
Free Cash Flow	$2.468B	$3.833B	$2.636B
YoY Change	-6.38%	14.36%	-10.13%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	40500000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-12900000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	115300000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	91100000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	72100000	USD
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000004904
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	1-3525
CY2020	dei	Entity Registrant Name EntityRegistrantName	AMERICAN ELECTRIC POWER CO INC.
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	NY
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	13-4922640
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	1 Riverside Plaza,
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Columbus,
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	OH
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	43215-2373
CY2020	dei	City Area Code CityAreaCode	(614)
CY2020	dei	Local Phone Number LocalPhoneNumber	716-1000
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020Q4	dei	Entity Public Float EntityPublicFloat	39549558010	USD
CY2020Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	496604194	shares
CY2020	us-gaap	Revenues Revenues	14918500000	USD
CY2019	us-gaap	Revenues Revenues	15561400000	USD
CY2018	us-gaap	Revenues Revenues	16195700000	USD
CY2020	us-gaap	Utilities Operating Expense Operations UtilitiesOperatingExpenseOperations	2572400000	USD
CY2019	us-gaap	Utilities Operating Expense Operations UtilitiesOperatingExpenseOperations	2743700000	USD
CY2018	us-gaap	Utilities Operating Expense Operations UtilitiesOperatingExpenseOperations	2979200000	USD
CY2020	us-gaap	Utilities Operating Expense Maintenance UtilitiesOperatingExpenseMaintenance	1010400000	USD
CY2019	us-gaap	Utilities Operating Expense Maintenance UtilitiesOperatingExpenseMaintenance	1213900000	USD
CY2018	us-gaap	Utilities Operating Expense Maintenance UtilitiesOperatingExpenseMaintenance	1247400000	USD
CY2020	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	0	USD
CY2019	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	156400000	USD
CY2018	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	70600000	USD
CY2020	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	2682800000	USD
CY2019	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	2514500000	USD
CY2018	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	2286600000	USD
CY2020	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	1295500000	USD
CY2019	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	1234500000	USD
CY2018	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	1142700000	USD
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CY2019	us-gaap	Operating Expenses OperatingExpenses	12969100000	USD
CY2018	us-gaap	Operating Expenses OperatingExpenses	13513000000.0	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	2987700000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	2592300000	USD
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CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	57000000.0	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	26600000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	18200000	USD
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	148100000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	168400000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	132500000	USD
CY2020	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-119000000.0	USD
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CY2020	us-gaap	Interest Expense InterestExpense	1165700000	USD
CY2019	us-gaap	Interest Expense InterestExpense	1072500000	USD
CY2018	us-gaap	Interest Expense InterestExpense	984400000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2146100000	USD
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CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-3400000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-1300000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	7500000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	2200100000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1921100000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1923800000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	495718223	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	493694345	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	492774600	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.44
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.89
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.90
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	497226867	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	495306238	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	493758277	shares
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.42
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.88
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CY2019	us-gaap	Profit Loss ProfitLoss	1919800000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	1931300000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	1800000	USD
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CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	16700000	USD
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CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.84
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CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.53
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	392700000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	246800000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	45600000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	185800000	USD
CY2020Q4	us-gaap	Short Term Investments ShortTermInvestments	200800000	USD
CY2019Q4	us-gaap	Short Term Investments ShortTermInvestments	202700000	USD
CY2020Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	613600000	USD
CY2019Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	625300000	USD
CY2020Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	248700000	USD
CY2019Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	222400000	USD
CY2020Q4	us-gaap	Transfers Accounted For As Secured Borrowings Assets Carrying Amount TransfersAccountedForAsSecuredBorrowingsAssetsCarryingAmount	1018400000	USD
CY2019Q4	us-gaap	Transfers Accounted For As Secured Borrowings Assets Carrying Amount TransfersAccountedForAsSecuredBorrowingsAssetsCarryingAmount	873900000	USD
CY2020Q4	us-gaap	Other Receivables OtherReceivables	33100000	USD
CY2019Q4	us-gaap	Other Receivables OtherReceivables	27200000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	71100000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	43700000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1842700000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1705100000	USD
CY2020Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	629400000	USD
CY2019Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	528500000	USD
CY2020Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	680600000	USD
CY2019Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	640700000	USD
CY2020Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	94700000	USD
CY2019Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	172800000	USD
CY2020Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	185300000	USD
CY2019Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	85800000	USD
CY2020Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	90700000	USD
CY2019Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	92900000	USD
CY2020Q4	us-gaap	Margin Deposit Assets MarginDepositAssets	62000000.0	USD
CY2019Q4	us-gaap	Margin Deposit Assets MarginDepositAssets	60400000	USD
CY2020Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	127000000.0	USD
CY2019Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	156300000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	4351500000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	4077800000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	23133900000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	22762400000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Transmission PublicUtilitiesPropertyPlantAndEquipmentTransmission	27886700000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Transmission PublicUtilitiesPropertyPlantAndEquipmentTransmission	24808600000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Distribution PublicUtilitiesPropertyPlantAndEquipmentDistribution	23972100000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Distribution PublicUtilitiesPropertyPlantAndEquipmentDistribution	22443400000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	5294600000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	4811500000	USD
CY2020Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	4025700000	USD
CY2019Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	4319800000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	84313000000.0	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	79145700000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	20411400000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	19007600000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	63901600000	USD
CY2019Q4	us-gaap	Customer Deposits Current CustomerDepositsCurrent	366100000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	60138100000	USD
CY2020Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	3527000000.0	USD
CY2019Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	3158800000	USD
CY2020Q4	us-gaap	Securitized Regulatory Transition Assets Noncurrent SecuritizedRegulatoryTransitionAssetsNoncurrent	657000000.0	USD
CY2019Q4	us-gaap	Securitized Regulatory Transition Assets Noncurrent SecuritizedRegulatoryTransitionAssetsNoncurrent	858100000	USD
CY2020Q4	aep	Spent Nuclear Fuel And Decommissioning Trusts SpentNuclearFuelAndDecommissioningTrusts	3306700000	USD
CY2019Q4	aep	Spent Nuclear Fuel And Decommissioning Trusts SpentNuclearFuelAndDecommissioningTrusts	2975700000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	52500000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	52500000	USD
CY2020Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	242200000	USD
CY2019Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	266600000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	866400000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	957400000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	3852300000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	3407300000	USD
CY2020Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	12504100000	USD
CY2019Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	11676400000	USD
CY2020Q4	us-gaap	Assets Assets	80757200000	USD
CY2019Q4	us-gaap	Assets Assets	75892300000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	1709700000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	2085800000	USD
CY2020Q4	us-gaap	Transfers Accounted For As Secured Borrowings Associated Liabilities Carrying Amount TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount	592000000.0	USD
CY2019Q4	us-gaap	Transfers Accounted For As Secured Borrowings Associated Liabilities Carrying Amount TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount	710000000.0	USD
CY2020Q4	us-gaap	Short Term Bank Loans And Notes Payable ShortTermBankLoansAndNotesPayable	1887300000	USD
CY2019Q4	us-gaap	Short Term Bank Loans And Notes Payable ShortTermBankLoansAndNotesPayable	2128300000	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	2479300000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	2838300000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	2086100000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	1598700000	USD
CY2020Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	78800000	USD
CY2019Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	114300000	USD
CY2020Q4	us-gaap	Customer Deposits Current CustomerDepositsCurrent	335600000	USD
CY2020Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	1476400000	USD
CY2019Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	1357800000	USD
CY2020Q4	us-gaap	Interest Payable Current InterestPayableCurrent	267600000	USD
CY2019Q4	us-gaap	Interest Payable Current InterestPayableCurrent	243600000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	241300000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	234100000	USD
CY2020Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	52600000	USD
CY2019Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	86600000	USD
CY2020Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	1199300000	USD
CY2019Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	1373800000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	9926700000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	10299100000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	28986400000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	25126800000	USD
CY2020Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	232800000	USD
CY2019Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	261800000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	8240900000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	7588200000	USD
CY2020Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	8378700000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	8457600000	USD
CY2020Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	2469200000	USD
CY2019Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	2216600000	USD
CY2020Q4	aep	Employee Benefits And Pension Obligations EmployeeBenefitsAndPensionObligations	336400000	USD
CY2019Q4	aep	Employee Benefits And Pension Obligations EmployeeBenefitsAndPensionObligations	466000000.0	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	638400000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	734600000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	728000000.0	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	719800000	USD
CY2020Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	50010800000	USD
CY2019Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	45571400000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	59937500000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	55870500000	USD
CY2020Q4	aep	Rate Matters RateMatters		USD
CY2019Q4	aep	Rate Matters RateMatters		USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	0	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	65700000	USD
CY2020Q4	aep	Mezzanine Equity MezzanineEquity	45200000	USD
CY2019Q4	aep	Mezzanine Equity MezzanineEquity	42900000	USD
CY2020Q4	aep	Total Mezzanine Equity TotalMezzanineEquity	45200000	USD
CY2019Q4	aep	Total Mezzanine Equity TotalMezzanineEquity	108600000	USD
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	6.50
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	6.50
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	600000000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	600000000	shares
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	516808354	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	514373631	shares
CY2020Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	20204160	shares
CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	20204160	shares
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	3359300000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	3343400000	USD
CY2020Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	6588900000	USD
CY2019Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	6535600000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	10687800000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	9900900000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-85100000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-147700000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	20550900000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	19632200000	USD
CY2020Q4	us-gaap	Minority Interest MinorityInterest	223600000	USD
CY2019Q4	us-gaap	Minority Interest MinorityInterest	281000000.0	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	20774500000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	19913200000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	80757200000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	75892300000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	2196700000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	1919800000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	1931300000	USD
CY2020	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	2682800000	USD
CY2019	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	2514500000	USD
CY2018	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	2286600000	USD
CY2020	aep	Operating Lease Cost Rockport OperatingLeaseCostRockport	136500000	USD
CY2019	aep	Operating Lease Cost Rockport OperatingLeaseCostRockport	136500000	USD
CY2018	aep	Operating Lease Cost Rockport OperatingLeaseCostRockport	0	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	196100000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-17800000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	104300000	USD
CY2020	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	0	USD
CY2019	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	156400000	USD
CY2018	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	70600000	USD
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	148100000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	168400000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	132500000	USD
CY2020	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-66500000	USD
CY2019	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	29200000	USD
CY2018	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	66400000	USD
CY2020	aep	Amortization Of Nuclear Fuel AmortizationOfNuclearFuel	87500000	USD
CY2019	aep	Amortization Of Nuclear Fuel AmortizationOfNuclearFuel	89100000	USD
CY2018	aep	Amortization Of Nuclear Fuel AmortizationOfNuclearFuel	113800000	USD
CY2020	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	-8500000	USD
CY2019	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	-24600000	USD
CY2018	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	-42800000	USD
CY2020	us-gaap	Pension Contributions PensionContributions	110300000	USD
CY2019	us-gaap	Pension Contributions PensionContributions	0	USD
CY2018	us-gaap	Pension Contributions PensionContributions	0	USD
CY2020	us-gaap	Amortization Of Deferred Property Taxes AmortizationOfDeferredPropertyTaxes	-43300000	USD
CY2019	us-gaap	Amortization Of Deferred Property Taxes AmortizationOfDeferredPropertyTaxes	-73800000	USD
CY2018	us-gaap	Amortization Of Deferred Property Taxes AmortizationOfDeferredPropertyTaxes	-59100000	USD
CY2020	aep	Fuel Over Under Recovery Net FuelOverUnderRecoveryNet	31800000	USD
CY2019	aep	Fuel Over Under Recovery Net FuelOverUnderRecoveryNet	-85200000	USD
CY2018	aep	Fuel Over Under Recovery Net FuelOverUnderRecoveryNet	-189700000	USD
CY2020	aep	Change In Regulatory Assets ChangeInRegulatoryAssets	337900000	USD
CY2019	aep	Change In Regulatory Assets ChangeInRegulatoryAssets	-49500000	USD
CY2018	aep	Change In Regulatory Assets ChangeInRegulatoryAssets	-354100000	USD
CY2020	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	142500000	USD
CY2019	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	112800000	USD
CY2018	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	172100000	USD
CY2020	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-54500000	USD
CY2019	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-116100000	USD
CY2018	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	129000000.0	USD
CY2020	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	129300000	USD
CY2019	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-247800000	USD
CY2018	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-145900000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	142900000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	248200000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-20700000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-35300000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	5800000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	36600000	USD
CY2020	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	20100000	USD
CY2019	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	138900000	USD
CY2018	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	153200000	USD
CY2020	aep	Operating Lease Payments Rockport OperatingLeasePaymentsRockport	147700000	USD
CY2019	aep	Operating Lease Payments Rockport OperatingLeasePaymentsRockport	147700000	USD
CY2018	aep	Operating Lease Payments Rockport OperatingLeasePaymentsRockport	0	USD
CY2020	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-34300000	USD
CY2019	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-70700000	USD
CY2020	us-gaap	Payments For Nuclear Fuel PaymentsForNuclearFuel	69700000	USD
CY2018	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-10500000	USD
CY2020	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-255500000	USD
CY2019	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-205500000	USD
CY2018	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	149800000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	3832900000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	4270100000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	5223200000	USD
CY2020	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	6246300000	USD
CY2019	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	6051400000	USD
CY2018	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	6310900000	USD
CY2020	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	1678800000	USD
CY2019	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	1576000000.0	USD
CY2018	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	2067800000	USD
CY2020	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	1644300000	USD
CY2019	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	1494200000	USD
CY2018	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	2010000000.0	USD
CY2019	us-gaap	Payments For Nuclear Fuel PaymentsForNuclearFuel	92300000	USD
CY2018	us-gaap	Payments For Nuclear Fuel PaymentsForNuclearFuel	46100000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	0	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	918400000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	0	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-116600000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	600000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-61200000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-6233900000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-7144500000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-6353600000	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	155000000.0	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	65300000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	73600000	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	5626100000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	4536600000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	4945700000	USD
CY2020	us-gaap	Proceeds From Short Term Debt Maturing In More Than Three Months ProceedsFromShortTermDebtMaturingInMoreThanThreeMonths	1396500000	USD
CY2019	us-gaap	Proceeds From Short Term Debt Maturing In More Than Three Months ProceedsFromShortTermDebtMaturingInMoreThanThreeMonths	0	USD
CY2018	us-gaap	Proceeds From Short Term Debt Maturing In More Than Three Months ProceedsFromShortTermDebtMaturingInMoreThanThreeMonths	205600000	USD
CY2020	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	-448400000	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	928300000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	271400000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1339800000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1220800000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	2782000000.0	USD
CY2020	us-gaap	Repayments Of Short Term Debt Maturing In More Than Three Months RepaymentsOfShortTermDebtMaturingInMoreThanThreeMonths	1307100000	USD
CY2019	us-gaap	Repayments Of Short Term Debt Maturing In More Than Three Months RepaymentsOfShortTermDebtMaturingInMoreThanThreeMonths	0	USD
CY2018	us-gaap	Repayments Of Short Term Debt Maturing In More Than Three Months RepaymentsOfShortTermDebtMaturingInMoreThanThreeMonths	205600000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	61700000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	70700000	USD
CY2018	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	65100000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1424900000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1350000000.0	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1255500000	USD
CY2020	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	-100200000	USD
CY2019	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	0	USD
CY2018	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	0	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-88800000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-25800000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-26200000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2406700000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2862900000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1161900000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	5700000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-11500000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	31500000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	432600000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	444100000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	412600000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	438300000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	432600000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	444100000	USD
CY2020	us-gaap	Basis Of Accounting BasisOfAccounting	<div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">ORGANIZATION</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">The Registrants engage in the generation, transmission and distribution of electric power. The Registrant Subsidiaries that conduct most of these activities are regulated by the FERC under the Federal Power Act and the Energy Policy Act of 2005 and maintain accounts in accordance with the FERC and other regulatory guidelines. Most of these companies are subject to further regulation with regard to rates and other matters by state regulatory commissions.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">AEP provides competitive electric and gas supply for residential, commercial and industrial customers in deregulated electricity markets and also provides energy management solutions throughout the United States, including energy efficiency services through its independent retail electric supplier.</span></div>The Registrants also engage in wholesale electricity, natural gas and other commodity marketing and risk management activities in the United States and provide various energy-related services. In addition, AEP operates competitive wind and solar farms. I&M provides barging services to both affiliated and nonaffiliated companies. SWEPCo, through consolidated and non-consolidated affiliates, conducts lignite mining operations to fuel certain of its generation facilities.
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-style:italic;font-weight:700;line-height:120%">Use of Estimates</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">The preparation of these financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. These estimates include, but are not limited to, inventory valuation, allowance for doubtful accounts, goodwill, intangible and long-lived asset impairment, unbilled electricity revenue, valuation of long-term energy contracts, the effects of regulation, long-lived asset recovery, storm costs, the effects of contingencies and certain assumptions made in accounting for pension and postretirement benefits. The estimates and assumptions used are based upon management’s evaluation of the relevant facts and circumstances as of the date of the financial statements. Actual results could ultimately differ from those estimates.</span></div>
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	392700000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	45600000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	438300000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	246800000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	185800000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	432600000	USD
CY2020	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	The Registrant Subsidiaries monitor credit levels and the financial condition of their customers on a continuous basis to minimize credit risk. The regulatory commissions allow recovery in rates for a reasonable level of bad debt costs. Management believes adequate provisions for credit loss have been made in the accompanying Registrant Subsidiary financial statements.
CY2020	aep	Amortizationof Certain Securitized Assets AmortizationofCertainSecuritizedAssets	171300000	USD
CY2020	aep	Amortizationof Regulatory Assetsand Liabilities AmortizationofRegulatoryAssetsandLiabilities	24000000.0	USD
CY2020	aep	Employees Participating In Voluntary Retirement Incentive Program EmployeesParticipatingInVoluntaryRetirementIncentiveProgram	200
CY2020	aep	Percent Of Voluntary Retirement Incentive Program Expense Related To Aep Service Corporation PercentOfVoluntaryRetirementIncentiveProgramExpenseRelatedToAEPServiceCorporation	0.92
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	2200100000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1921100000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1923800000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	495700000	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.44
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	493700000	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.89
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	492800000	shares
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.90
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	497200000	shares
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.42
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	495300000	shares
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.88
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	493800000	shares
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.90
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	128000	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2020	us-gaap	Depreciation Depreciation	2487500000	USD
CY2019	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	87500000	USD
CY2020	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	2682800000	USD
CY2019	us-gaap	Depreciation Depreciation	2203700000	USD
CY2019	aep	Amortizationof Certain Securitized Assets AmortizationofCertainSecuritizedAssets	280700000	USD
CY2019	aep	Amortizationof Regulatory Assetsand Liabilities AmortizationofRegulatoryAssetsandLiabilities	30100000	USD
CY2019	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	2514500000	USD
CY2018	us-gaap	Depreciation Depreciation	1965000000.0	USD
CY2018	aep	Amortizationof Certain Securitized Assets AmortizationofCertainSecuritizedAssets	287900000	USD
CY2018	aep	Amortizationof Regulatory Assetsand Liabilities AmortizationofRegulatoryAssetsandLiabilities	33700000	USD
CY2018	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	2286600000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	1029100000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	1022500000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	939300000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-49100000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	6100000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-24700000	USD
CY2020	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	44200000	USD
CY2018	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	55600000	USD
CY2020	us-gaap	Construction In Progress Expenditures Incurred But Not Yet Paid ConstructionInProgressExpendituresIncurredButNotYetPaid	975400000	USD
CY2019	us-gaap	Construction In Progress Expenditures Incurred But Not Yet Paid ConstructionInProgressExpendituresIncurredButNotYetPaid	1341100000	USD
CY2018	us-gaap	Construction In Progress Expenditures Incurred But Not Yet Paid ConstructionInProgressExpendituresIncurredButNotYetPaid	1120400000	USD
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	5500000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	0	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	0	USD
CY2020	aep	Acquisition Of Nuclear Fuel Included In Current Liabilities AcquisitionOfNuclearFuelIncludedInCurrentLiabilities	33400000	USD
CY2019	aep	Acquisition Of Nuclear Fuel Included In Current Liabilities AcquisitionOfNuclearFuelIncludedInCurrentLiabilities	100000	USD
CY2018	aep	Acquisition Of Nuclear Fuel Included In Current Liabilities AcquisitionOfNuclearFuelIncludedInCurrentLiabilities	4000000.0	USD
CY2020	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	0	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	0	USD
CY2018	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	84000000.0	USD
CY2020	aep	Expected Reimbursement For Spent Nuclear Fuel Dry Cask Storage ExpectedReimbursementForSpentNuclearFuelDryCaskStorage	2600000	USD
CY2019	aep	Expected Reimbursement For Spent Nuclear Fuel Dry Cask Storage ExpectedReimbursementForSpentNuclearFuelDryCaskStorage	300000	USD
CY2018	aep	Expected Reimbursement For Spent Nuclear Fuel Dry Cask Storage ExpectedReimbursementForSpentNuclearFuelDryCaskStorage	2200000	USD
CY2020	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	0	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	32400000	USD
CY2018	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	0	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-147700000	USD
CY2020	aep	Other Comprehensive Income Unrealized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossArisingDuringPeriodNetOfTax	-66400000	USD
CY2020	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	163200000	USD
CY2020	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	129000000.0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	62600000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-85100000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-120400000	USD
CY2019	aep	Other Comprehensive Income Unrealized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossArisingDuringPeriodNetOfTax	-69700000	USD
CY2019	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	53700000	USD
CY2019	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	42400000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-27300000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-147700000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-67800000	USD
CY2018	aep	Other Comprehensive Income Unrealized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossArisingDuringPeriodNetOfTax	6600000	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	-38300000	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-30300000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-23700000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-120400000	USD
CY2020Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	90700000	USD
CY2019Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	92900000	USD
CY2020Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	3527000000.0	USD
CY2019Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	3158800000	USD
CY2020Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	52600000	USD
CY2019Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	86600000	USD
CY2020Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	8378700000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	8457600000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2020Q4	us-gaap	Recorded Unconditional Purchase Obligation Due Within One Year RecordedUnconditionalPurchaseObligationDueWithinOneYear	975500000	USD
CY2020Q4	aep	Recorded Unconditional Purchase Obligation Due Within Two To Three Year RecordedUnconditionalPurchaseObligationDueWithinTwoToThreeYear	1006900000	USD
CY2020Q4	aep	Recorded Unconditional Purchase Obligation Due Within Four To Five Year RecordedUnconditionalPurchaseObligationDueWithinFourToFiveYear	489900000	USD
CY2020Q4	us-gaap	Recorded Unconditional Purchase Obligation Due After Fifth Year RecordedUnconditionalPurchaseObligationDueAfterFifthYear	1310000000.0	USD
CY2020Q4	us-gaap	Recorded Unconditional Purchase Obligation RecordedUnconditionalPurchaseObligation	3782300000	USD
CY2020	us-gaap	Asset Retirement Obligation Period Increase Decrease AssetRetirementObligationPeriodIncreaseDecrease	199000000	USD
CY2020	aep	Matching Contributions Provided Percentage MatchingContributionsProvidedPercentage	1
CY2020	aep	Eligible Compensation Contribution By Employee Percentage EligibleCompensationContributionByEmployeePercentage	0.01
CY2020	aep	Second Matching Contributions Provided Percentage SecondMatchingContributionsProvidedPercentage	0.70
CY2020	aep	Second Eligible Compensation Contribution By Employee Percentage SecondEligibleCompensationContributionByEmployeePercentage	0.05
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	81800000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	76400000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	71800000	USD
CY2020Q4	us-gaap	Multiemployer Plans Withdrawal Obligation MultiemployerPlansWithdrawalObligation	25000000	USD
CY2019Q4	us-gaap	Multiemployer Plans Withdrawal Obligation MultiemployerPlansWithdrawalObligation	20000000	USD
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	14918500000	USD
CY2020	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	0	USD
CY2020	us-gaap	Revenues Revenues	14918500000	USD
CY2020	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	2682800000	USD
CY2020	us-gaap	Interest Expense InterestExpense	1165700000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	40500000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	91100000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	2196700000	USD
CY2020	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	6246300000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	84313000000.0	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	20411400000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	63901600000	USD
CY2020Q4	us-gaap	Assets Assets	80757200000	USD
CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	1406300000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	2086100000	USD
CY2020Q4	aep	Affiliated Long Term Debt Noncurrent AffiliatedLongTermDebtNoncurrent	0	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	28986400000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	31072500000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	15561400000	USD
CY2019	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	0	USD
CY2019	us-gaap	Revenues Revenues	15561400000	USD
CY2019	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	156400000	USD
CY2019	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	2514500000	USD
CY2019	us-gaap	Interest Expense InterestExpense	1072500000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-12900000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	72100000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	1919800000	USD
CY2019	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	6969800000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	79145700000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	19007600000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	60138100000	USD
CY2019Q4	us-gaap	Assets Assets	75892300000	USD
CY2019Q4	us-gaap	Equity Method Investments EquityMethodInvestments	1356600000	USD
CY2019Q4	aep	Affiliated Long Term Debt Current AffiliatedLongTermDebtCurrent	0	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	1598700000	USD
CY2019Q4	aep	Affiliated Long Term Debt Noncurrent AffiliatedLongTermDebtNoncurrent	0	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	25126800000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	26725500000	USD
CY2018	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	16195700000	USD
CY2018	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	0	USD
CY2018	us-gaap	Revenues Revenues	16195700000	USD
CY2018	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	70600000	USD
CY2018	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	2286600000	USD
CY2018	us-gaap	Interest Expense InterestExpense	984400000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	115300000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	73100000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	1931300000	USD
CY2018	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	6325500000	USD
CY2018Q4	us-gaap	Assets Assets	68802800000	USD
CY2020Q4	us-gaap	Securities Received As Collateral SecuritiesReceivedAsCollateral	3000000	USD
CY2019Q4	us-gaap	Securities Received As Collateral SecuritiesReceivedAsCollateral	5000000	USD
CY2020Q4	us-gaap	Obligation To Return Securities Received As Collateral ObligationToReturnSecuritiesReceivedAsCollateral	7000000	USD
CY2019Q4	us-gaap	Obligation To Return Securities Received As Collateral ObligationToReturnSecuritiesReceivedAsCollateral	39000000	USD
CY2020	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	116900000	USD
CY2019	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	125000000.0	USD
CY2018	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	291300000	USD
CY2020Q4	aep	Carrying Amountof Hedged Asset Liability CarryingAmountofHedgedAssetLiability	-995900000	USD
CY2019Q4	aep	Carrying Amountof Hedged Asset Liability CarryingAmountofHedgedAssetLiability	-510800000	USD
CY2020Q4	aep	Cumulative Fair Value Hedging Adjustmentinthe Carrying Amountofthe Hedged Asset Liability CumulativeFairValueHedgingAdjustmentintheCarryingAmountoftheHedgedAssetLiability	-51700000	USD
CY2019Q4	aep	Cumulative Fair Value Hedging Adjustmentinthe Carrying Amountofthe Hedged Asset Liability CumulativeFairValueHedgingAdjustmentintheCarryingAmountoftheHedgedAssetLiability	-14500000	USD
CY2020Q4	us-gaap	Hedged Liability Discontinued Fair Value Hedge Cumulative Increase Decrease HedgedLiabilityDiscontinuedFairValueHedgeCumulativeIncreaseDecrease	-53000000	USD
CY2019Q4	us-gaap	Hedged Liability Discontinued Fair Value Hedge Cumulative Increase Decrease HedgedLiabilityDiscontinuedFairValueHedgeCumulativeIncreaseDecrease	0	USD
CY2020	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	41100000	USD
CY2019	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	31900000	USD
CY2018	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-11300000	USD
CY2020	aep	Gain Loss On Fair Value Portion Of Long Term Debt GainLossOnFairValuePortionOfLongTermDebt	-41100000	USD
CY2019	aep	Gain Loss On Fair Value Portion Of Long Term Debt GainLossOnFairValuePortionOfLongTermDebt	-31900000	USD
CY2018	aep	Gain Loss On Fair Value Portion Of Long Term Debt GainLossOnFairValuePortionOfLongTermDebt	11300000	USD
CY2020Q4	aep	Notional Amount Of A Discontinued Hedge NotionalAmountOfADiscontinuedHedge	500000000	USD
CY2020Q4	us-gaap	Deferred Gain Loss On Discontinuation Of Fair Value Hedge DeferredGainLossOnDiscontinuationOfFairValueHedge	57000000	USD
CY2020Q4	us-gaap	Deferred Gain Loss On Discontinuation Of Fair Value Hedge DeferredGainLossOnDiscontinuationOfFairValueHedge	57000000	USD
CY2020Q4	aep	Fair Value Of Derivative Liabilities Subject To Cross Default Provisions FairValueOfDerivativeLiabilitiesSubjectToCrossDefaultProvisions	188400000	USD
CY2020Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	0	USD
CY2020Q4	us-gaap	Assets Needed For Immediate Settlement Aggregate Fair Value AssetsNeededForImmediateSettlementAggregateFairValue	169200000	USD
CY2019Q4	aep	Fair Value Of Derivative Liabilities Subject To Cross Default Provisions FairValueOfDerivativeLiabilitiesSubjectToCrossDefaultProvisions	267300000	USD
CY2019Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	3700000	USD
CY2019Q4	us-gaap	Assets Needed For Immediate Settlement Aggregate Fair Value AssetsNeededForImmediateSettlementAggregateFairValue	246700000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	31072500000	USD
CY2020Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	37457000000.0	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	26725500000	USD
CY2019Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	30172000000.0	USD
CY2020Q4	us-gaap	Investment Owned At Cost InvestmentOwnedAtCost	214900000	USD
CY2020Q4	us-gaap	Investment Owned Unrecognized Unrealized Appreciation InvestmentOwnedUnrecognizedUnrealizedAppreciation	31500000	USD
CY2020Q4	us-gaap	Investment Owned Unrecognized Unrealized Depreciation InvestmentOwnedUnrecognizedUnrealizedDepreciation	0	USD
CY2020Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	246400000	USD
CY2019Q4	us-gaap	Investment Owned At Cost InvestmentOwnedAtCost	367100000	USD
CY2019Q4	us-gaap	Investment Owned Unrecognized Unrealized Appreciation InvestmentOwnedUnrecognizedUnrealizedAppreciation	21400000	USD
CY2019Q4	us-gaap	Investment Owned Unrecognized Unrealized Depreciation InvestmentOwnedUnrecognizedUnrealizedDepreciation	0	USD
CY2019Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	388500000	USD
CY2020	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	50900000	USD
CY2019	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	21200000	USD
CY2018	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	0	USD
CY2020	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	41600000	USD
CY2019	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	45000000.0	USD
CY2018	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	3100000	USD
CY2020	aep	Gross Realized Gains On Investment Sales On Short Term Investment GrossRealizedGainsOnInvestmentSalesOnShortTermInvestment	3800000	USD
CY2019	aep	Gross Realized Gains On Investment Sales On Short Term Investment GrossRealizedGainsOnInvestmentSalesOnShortTermInvestment	0	USD
CY2018	aep	Gross Realized Gains On Investment Sales On Short Term Investment GrossRealizedGainsOnInvestmentSalesOnShortTermInvestment	0	USD
CY2020	aep	Gross Realized Losses On Investment Sales On Short Term Investment GrossRealizedLossesOnInvestmentSalesOnShortTermInvestment	200000	USD
CY2019	aep	Gross Realized Losses On Investment Sales On Short Term Investment GrossRealizedLossesOnInvestmentSalesOnShortTermInvestment	400000	USD
CY2018	aep	Gross Realized Losses On Investment Sales On Short Term Investment GrossRealizedLossesOnInvestmentSalesOnShortTermInvestment	0	USD
CY2020Q4	aep	Spent Nuclear Fuel And Decommissioning Trusts SpentNuclearFuelAndDecommissioningTrusts	3306700000	USD
CY2019Q4	aep	Spent Nuclear Fuel And Decommissioning Trusts SpentNuclearFuelAndDecommissioningTrusts	2975700000	USD
CY2020Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	246400000	USD
CY2020Q4	us-gaap	Derivative Assets DerivativeAssets	336900000	USD
CY2020Q4	aep	Spent Nuclear Fuel And Decommissioning Trusts SpentNuclearFuelAndDecommissioningTrusts	3306700000	USD
CY2020Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	3921800000	USD
CY2020Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	311600000	USD
CY2019Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	388500000	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	439400000	USD
CY2019Q4	aep	Spent Nuclear Fuel And Decommissioning Trusts SpentNuclearFuelAndDecommissioningTrusts	2975700000	USD
CY2019Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	3803600000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	376100000	USD
CY2019Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	109900000	USD
CY2020	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Earnings FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings	39500000	USD
CY2020	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Change In Unrealized Gain Loss FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	35300000	USD
CY2020	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Other Comprehensive Income Loss FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInOtherComprehensiveIncomeLoss	13800000	USD
CY2020	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Purchases Sales Issues Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchasesSalesIssuesSettlements	-113100000	USD
CY2020	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Into Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3	-3800000	USD
CY2020	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Out Of Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3	5600000	USD
CY2020	aep	Changes In Fair Value Allocated To Regulated Jurisdiction ChangesInFairValueAllocatedToRegulatedJurisdiction	26100000	USD
CY2020Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	113300000	USD
CY2018Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	131200000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Earnings FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings	15800000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Change In Unrealized Gain Loss FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	-100000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Other Comprehensive Income Loss FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInOtherComprehensiveIncomeLoss	-15100000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Purchases Sales Issues Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchasesSalesIssuesSettlements	-117600000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Into Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3	-600000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Out Of Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3	35600000	USD
CY2019	aep	Changes In Fair Value Allocated To Regulated Jurisdiction ChangesInFairValueAllocatedToRegulatedJurisdiction	60700000	USD
CY2019Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	109900000	USD
CY2017Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	40300000	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Earnings FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings	148900000	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Change In Unrealized Gain Loss FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	9800000	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Other Comprehensive Income Loss FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInOtherComprehensiveIncomeLoss	15700000	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Purchases Sales Issues Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchasesSalesIssuesSettlements	-214000000.0	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Into Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3	15800000	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Out Of Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3	-1600000	USD
CY2018	aep	Changes In Fair Value Allocated To Regulated Jurisdiction ChangesInFairValueAllocatedToRegulatedJurisdiction	116300000	USD
CY2018Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	131200000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-138200000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	146900000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-11400000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	40500000	USD
CY2020	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	8700000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-16700000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	48500000	USD
CY2020	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	31800000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	40500000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-7400000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-71600000	USD
CY2019	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	-79000000.0	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	4400000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	61700000	USD
CY2019	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	66100000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-12900000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-31700000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	122000000.0	USD
CY2018	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	90300000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	30800000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-5800000	USD
CY2018	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	25000000.0	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	115300000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	2196700000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	1919800000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	1931300000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	40500000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-12900000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	115300000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	2234300000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1903900000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	2043900000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	469200000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	399800000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	429200000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	26500000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	20400000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	24600000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	18800000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	13000000.0	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	20400000	USD
CY2020	aep	Increase Decrease In Income Taxes Due To Energy Production Credits IncreaseDecreaseInIncomeTaxesDueToEnergyProductionCredits	-83100000	USD
CY2019	aep	Increase Decrease In Income Taxes Due To Energy Production Credits IncreaseDecreaseInIncomeTaxesDueToEnergyProductionCredits	-59600000	USD
CY2018	aep	Increase Decrease In Income Taxes Due To Energy Production Credits IncreaseDecreaseInIncomeTaxesDueToEnergyProductionCredits	-10300000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Settlements State And Local IncomeTaxReconciliationTaxSettlementsStateAndLocal	25100000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Settlements State And Local IncomeTaxReconciliationTaxSettlementsStateAndLocal	52200000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Settlements State And Local IncomeTaxReconciliationTaxSettlementsStateAndLocal	19700000	USD
CY2020	aep	Increase Decrease In Income Taxes Due To Removal Costs IncreaseDecreaseInIncomeTaxesDueToRemovalCosts	-18600000	USD
CY2019	aep	Increase Decrease In Income Taxes Due To Removal Costs IncreaseDecreaseInIncomeTaxesDueToRemovalCosts	-22200000	USD
CY2018	aep	Increase Decrease In Income Taxes Due To Removal Costs IncreaseDecreaseInIncomeTaxesDueToRemovalCosts	-18600000	USD
CY2020	aep	Increase Decrease In Income Taxes Afudc IncreaseDecreaseInIncomeTaxesAfudc	-32500000	USD
CY2019	aep	Increase Decrease In Income Taxes Afudc IncreaseDecreaseInIncomeTaxesAfudc	-37100000	USD
CY2018	aep	Increase Decrease In Income Taxes Afudc IncreaseDecreaseInIncomeTaxesAfudc	-29400000	USD
CY2020	aep	Tax Reform Adjustments TaxReformAdjustments	0	USD
CY2019	aep	Tax Reform Adjustments TaxReformAdjustments	0	USD
CY2018	aep	Tax Reform Adjustments TaxReformAdjustments	-10900000	USD
CY2020	aep	Tax Reform Excess Adit Reversal TaxReformExcessADITReversal	-268200000	USD
CY2019	aep	Tax Reform Excess Adit Reversal TaxReformExcessADITReversal	-353200000	USD
CY2018	aep	Tax Reform Excess Adit Reversal TaxReformExcessADITReversal	-257200000	USD
CY2020	aep	Caresact Provision CARESACTProvision	-48000000.0	USD
CY2019	aep	Caresact Provision CARESACTProvision	0	USD
CY2018	aep	Caresact Provision CARESACTProvision	0	USD
CY2020	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-11100000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-200000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-12900000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	115300000	USD
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.018
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.007
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.056
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	3259700000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	3246100000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	11500600000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	10834300000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	8240900000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	7588200000	USD
CY2020Q4	aep	Deferred Tax Assets Liabilities Net Property Related Temporary Differences DeferredTaxAssetsLiabilitiesNetPropertyRelatedTemporaryDifferences	7340500000	USD
CY2019Q4	aep	Deferred Tax Assets Liabilities Net Property Related Temporary Differences DeferredTaxAssetsLiabilitiesNetPropertyRelatedTemporaryDifferences	6602900000	USD
CY2020Q4	aep	Amounts Due From Customers For Future Federal Income Taxes AmountsDueFromCustomersForFutureFederalIncomeTaxes	-1075800000	USD
CY2019Q4	aep	Amounts Due From Customers For Future Federal Income Taxes AmountsDueFromCustomersForFutureFederalIncomeTaxes	-1173500000	USD
CY2020Q4	aep	Deferred State Income Taxes DeferredStateIncomeTaxes	1317600000	USD
CY2019Q4	aep	Deferred State Income Taxes DeferredStateIncomeTaxes	1198000000.0	USD
CY2020Q4	aep	Deferred Tax Assets Liabilities Securitized Assets DeferredTaxAssetsLiabilitiesSecuritizedAssets	140000000.0	USD
CY2019Q4	aep	Deferred Tax Assets Liabilities Securitized Assets DeferredTaxAssetsLiabilitiesSecuritizedAssets	178700000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	391600000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	371100000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	-626400000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	-557400000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	112900000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	77600000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards General Business DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness	323600000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards General Business DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness	247200000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	183700000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	182600000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	362000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	446600000	USD
CY2020Q4	aep	All Other Net AllOtherNet	-241200000	USD
CY2019Q4	aep	All Other Net AllOtherNet	-85600000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	8240900000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	7588200000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	24100000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	14600000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	86600000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	600000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	8800000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	100000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	14500000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	2100000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3000000.0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2800000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	71000000.0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1100000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	13200000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	24100000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	14600000	USD
CY2020	aep	Periodwith No Changein Unrecognized Tax Benefits PeriodwithNoChangeinUnrecognizedTaxBenefits	P12M
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	12000000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	20000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	12000000	USD
CY2020	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	20000000	USD
CY2020Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	95000000	USD
CY2014	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2020	us-gaap	Tax Cuts And Jobs Act Of2017 Change In Tax Rate Deferred Tax Asset Income Tax Expense TaxCutsAndJobsActOf2017ChangeInTaxRateDeferredTaxAssetIncomeTaxExpense	48000000	USD
CY2020Q4	aep	Meals And Entertainment Deductibility Percentage MealsAndEntertainmentDeductibilityPercentage	1
CY2020Q4	aep	Deferred Tax Liabilities Property Plant And Equipment Percentage DeferredTaxLiabilitiesPropertyPlantAndEquipmentPercentage	1
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Deductions EffectiveIncomeTaxRateReconciliationDeductions	0.10
CY2020Q4	aep	Tax Cuts And Jobs Act Non Deductible Executive Compensation TaxCutsAndJobsActNonDeductibleExecutiveCompensation	1000000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	279600000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	61900000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	15400000	USD
CY2020	us-gaap	Lease Cost LeaseCost	356900000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	286000000.0	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	70800000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	16400000	USD
CY2019	us-gaap	Lease Cost LeaseCost	373200000	USD
CY2018	us-gaap	Operating Lease Cost OperatingLeaseCost	245000000.0	USD
CY2018	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	62400000	USD
CY2018	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	16400000	USD
CY2018	us-gaap	Lease Cost LeaseCost	323800000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y3M18D
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P5Y5M4D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0344
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0568
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y2M23D
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P5Y10M6D
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0360
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0598
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	280300000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	15400000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	61700000	USD
CY2020	aep	Noncash Acquisitions Under Operating Leases NoncashAcquisitionsUnderOperatingLeases	161700000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	284700000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	16400000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	70700000	USD
CY2019	aep	Noncash Acquisitions Under Operating Leases NoncashAcquisitionsUnderOperatingLeases	125000000.0	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	284200000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	289100000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	303100000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	306800000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	638400000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	241300000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	879700000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	734600000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	234100000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	968700000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due In Next Rolling Twelve Months FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths	72200000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Two FinanceLeaseLiabilityPaymentsDueInRollingYearTwo	64000000.0	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Three FinanceLeaseLiabilityPaymentsDueInRollingYearThree	56200000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Four FinanceLeaseLiabilityPaymentsDueInRollingYearFour	63500000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Five FinanceLeaseLiabilityPaymentsDueInRollingYearFive	32700000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due In Rolling After Year Five FinanceLeaseLiabilityPaymentsDueInRollingAfterYearFive	48900000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	337500000	USD
CY2020Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	48400000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	289100000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Rolling Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths	270800000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Two LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo	263300000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Three LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree	94200000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Four LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour	81600000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive	68000000.0	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterRollingYearFive	193000000.0	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	970900000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	91200000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	879700000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due In Next Rolling Twelve Months FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths	72700000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Two FinanceLeaseLiabilityPaymentsDueInRollingYearTwo	64900000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Three FinanceLeaseLiabilityPaymentsDueInRollingYearThree	56400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Four FinanceLeaseLiabilityPaymentsDueInRollingYearFour	49600000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Five FinanceLeaseLiabilityPaymentsDueInRollingYearFive	57400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due In Rolling After Year Five FinanceLeaseLiabilityPaymentsDueInRollingAfterYearFive	64400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	365400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	58600000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	306800000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Rolling Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths	269900000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Two LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo	253600000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Three LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree	245600000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Four LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour	74800000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive	62000000.0	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterRollingYearFive	169700000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	1075600000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	106900000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	968700000	USD
CY2020Q4	aep	Max Potential Loss On Master Lease Agreements MaxPotentialLossOnMasterLeaseAgreements	50300000	USD
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	512210644	shares
CY2017Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	20205046	shares
CY2018	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	1239392	shares
CY2018	us-gaap	Partners Capital Account Units Treasury Units Reissued PartnersCapitalAccountUnitsTreasuryUnitsReissued	886	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	513450036	shares
CY2018Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	20204160	shares
CY2019	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	923595	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	514373631	shares
CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	20204160	shares
CY2020	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	2434723	shares
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	516808354	shares
CY2020Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	20204160	shares
CY2020	aep	Maximum Value Of Shares To Be Issued Under Atm Program MaximumValueOfSharesToBeIssuedUnderATMProgram	1000000000	USD
CY2020	aep	Maximum Percentage Paid To Selling Agents MaximumPercentagePaidToSellingAgents	0.02
CY2020Q4	us-gaap	Unsecured Debt UnsecuredDebt	25116100000	USD
CY2019Q4	us-gaap	Unsecured Debt UnsecuredDebt	21180700000	USD
CY2020Q4	us-gaap	Longterm Pollution Control Bond Current And Noncurrent LongtermPollutionControlBondCurrentAndNoncurrent	1936700000	USD
CY2019Q4	us-gaap	Longterm Pollution Control Bond Current And Noncurrent LongtermPollutionControlBondCurrentAndNoncurrent	1998800000	USD
CY2020Q4	us-gaap	Other Notes Payable OtherNotesPayable	239100000	USD
CY2019Q4	us-gaap	Other Notes Payable OtherNotesPayable	234300000	USD
CY2020Q4	us-gaap	Secured Debt SecuredDebt	716400000	USD
CY2019Q4	us-gaap	Secured Debt SecuredDebt	1025100000	USD
CY2020Q4	us-gaap	Spent Nuclear Fuel Obligation Noncurrent SpentNuclearFuelObligationNoncurrent	281200000	USD
CY2019Q4	us-gaap	Spent Nuclear Fuel Obligation Noncurrent SpentNuclearFuelObligationNoncurrent	279800000	USD
CY2020Q4	us-gaap	Junior Subordinated Notes JuniorSubordinatedNotes	1624100000	USD
CY2019Q4	us-gaap	Junior Subordinated Notes JuniorSubordinatedNotes	787800000	USD
CY2020Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	1158900000	USD
CY2019Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	1219000000.0	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	31072500000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	26725500000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	2086100000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	3538400000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	2659300000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	723400000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	1726300000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	20599200000	USD
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	31332700000	USD
CY2020Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	260200000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	31072500000	USD
CY2020Q4	aep	Restricted Net Assets RestrictedNetAssets	14000000000	USD
CY2020Q4	aep	Dividend Payment Restrictions DividendPaymentRestrictions	2369500000	USD
CY2020	aep	Maximum Percentage Debt To Capitalization MaximumPercentageDebtToCapitalization	0.675
CY2020Q4	us-gaap	Retained Earnings Unappropriated RetainedEarningsUnappropriated	7100000000	USD
CY2020Q4	aep	Credit Facilities Structured CreditFacilitiesStructured	4000000000	USD
CY2020	us-gaap	Debt Instrument Interest Rate During Period DebtInstrumentInterestRateDuringPeriod	0.0128
CY2020	us-gaap	Shortterm Debt Maximum Amount Outstanding During Period ShorttermDebtMaximumAmountOutstandingDuringPeriod	3000000000	USD
CY2020Q4	us-gaap	Transfers Accounted For As Secured Borrowings Associated Liabilities Carrying Amount TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount	592000000.0	USD
CY2020Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0085
CY2019Q4	us-gaap	Transfers Accounted For As Secured Borrowings Associated Liabilities Carrying Amount TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount	710000000.0	USD
CY2019Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0242
CY2020Q4	us-gaap	Commercial Paper CommercialPaper	1852300000	USD
CY2019Q4	us-gaap	Commercial Paper CommercialPaper	2110000000.0	USD
CY2020Q4	us-gaap	Notes Payable NotesPayable	35000000.0	USD
CY2019Q4	us-gaap	Notes Payable NotesPayable	18300000	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	2479300000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	2838300000	USD
CY2019Q4	us-gaap	Delinquent Amount At End Of Period On Loans Managed And Securitized DelinquentAmountAtEndOfPeriodOnLoansManagedAndSecuritized	39600000	USD
CY2020Q4	aep	Bad Debt Reserves Related To Securitized Sale Of Accounts Receivable BadDebtReservesRelatedToSecuritizedSaleOfAccountsReceivable	60000000.0	USD
CY2019Q4	aep	Bad Debt Reserves Related To Securitized Sale Of Accounts Receivable BadDebtReservesRelatedToSecuritizedSaleOfAccountsReceivable	32100000	USD
CY2020Q4	aep	Total Commitment From Bank Conduits To Finance Receivables TotalCommitmentFromBankConduitsToFinanceReceivables	750000000	USD
CY2020	aep	Effective Interest Rates On Securitization Of Accounts Receivable EffectiveInterestRatesOnSecuritizationOfAccountsReceivable	0.0085
CY2019	aep	Effective Interest Rates On Securitization Of Accounts Receivable EffectiveInterestRatesOnSecuritizationOfAccountsReceivable	0.0242
CY2018	aep	Effective Interest Rates On Securitization Of Accounts Receivable EffectiveInterestRatesOnSecuritizationOfAccountsReceivable	0.0216
CY2020	aep	Net Uncollectible Accounts Receivable Written Off NetUncollectibleAccountsReceivableWrittenOff	15300000	USD
CY2019	aep	Net Uncollectible Accounts Receivable Written Off NetUncollectibleAccountsReceivableWrittenOff	26600000	USD
CY2018	aep	Net Uncollectible Accounts Receivable Written Off NetUncollectibleAccountsReceivableWrittenOff	27600000	USD
CY2020Q4	aep	Accounts Receivable Retained Interest And Pledged As Collateral Less Uncollectible Accounts AccountsReceivableRetainedInterestAndPledgedAsCollateralLessUncollectibleAccounts	958400000	USD
CY2019Q4	aep	Accounts Receivable Retained Interest And Pledged As Collateral Less Uncollectible Accounts AccountsReceivableRetainedInterestAndPledgedAsCollateralLessUncollectibleAccounts	841800000	USD
CY2020Q4	us-gaap	Principal Amount Outstanding On Loans Held For Sale Or Securitization PrincipalAmountOutstandingOnLoansHeldForSaleOrSecuritization	592000000.0	USD
CY2019Q4	us-gaap	Principal Amount Outstanding On Loans Held For Sale Or Securitization PrincipalAmountOutstandingOnLoansHeldForSaleOrSecuritization	710000000.0	USD
CY2020Q4	us-gaap	Delinquent Amount At End Of Period On Loans Managed And Securitized DelinquentAmountAtEndOfPeriodOnLoansManagedAndSecuritized	62300000	USD
CY2020Q4	aep	Unbilled Receivables Related To Securitization Sale Of Accounts Receivable UnbilledReceivablesRelatedToSecuritizationSaleOfAccountsReceivable	296800000	USD
CY2019Q4	aep	Unbilled Receivables Related To Securitization Sale Of Accounts Receivable UnbilledReceivablesRelatedToSecuritizationSaleOfAccountsReceivable	266800000	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	10000000	shares
CY2020Q4	us-gaap	Common Stock Capital Shares Reserved For Future Issuance CommonStockCapitalSharesReservedForFutureIssuance	6712148	shares
CY2020Q4	aep	Reductionin Aggregate Common Shares Authorized Per Share Issued Pursuantto Stock Optionsor Stock Appreciation Rights ReductioninAggregateCommonSharesAuthorizedPerShareIssuedPursuanttoStockOptionsorStockAppreciationRights	0.286	shares
CY2020	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	183100000	USD
CY2019	aep	Related Party Charitable Contribuionsto Aep Foundation RelatedPartyCharitableContribuionstoAEPFoundation	50000000.0	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	2516700000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	2355500000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	63901600000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	60138100000	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	102500000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	2418900000	USD
CY2020	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	102400000	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	300000	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	188000000.0	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	12000000.0	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	118100000	USD
CY2019	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	67000000.0	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	2418900000	USD
CY2020Q4	us-gaap	Decommissioning Liability Noncurrent DecommissioningLiabilityNoncurrent	1800000000	USD
CY2019Q4	us-gaap	Decommissioning Liability Noncurrent DecommissioningLiabilityNoncurrent	1730000000	USD
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	148100000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	168400000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	132500000	USD
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	66000000.0	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	88700000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	73600000	USD
CY2020Q4	us-gaap	Jointly Owned Utility Plant Gross Ownership Amount Of Plant In Service JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService	2916700000	USD
CY2020Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Construction Work In Progress JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress	14100000	USD
CY2020Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Plant Accumulated Depreciation JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation	1109700000	USD
CY2019Q4	us-gaap	Jointly Owned Utility Plant Gross Ownership Amount Of Plant In Service JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService	3019300000	USD
CY2019Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Construction Work In Progress JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress	19100000	USD
CY2019Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Plant Accumulated Depreciation JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation	1051900000	USD
CY2020	us-gaap	Revenues Revenues	14918500000	USD
CY2019	us-gaap	Revenues Revenues	15561400000	USD
CY2018	us-gaap	Revenues Revenues	16195700000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	1610700000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	52500000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019Q4	us-gaap	Goodwill Goodwill	52500000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020Q4	us-gaap	Goodwill Goodwill	52500000	USD

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$AEP
AMERICAN ELECTRIC POWER CO INC Stock $aep

2020 Q4 Form 10-K Financial Statement

#000000490421000010 Filed on February 25, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AEP AMERICAN ELECTRIC POWER CO INC Stock $aep

2020 Q4 Form 10-K Financial Statement

#000000490421000010 Filed on February 25, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AEP
AMERICAN ELECTRIC POWER CO INC Stock $aep