$FNB
FNB CORP/PA/ Stock $fnb

$fnb Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-Q Financial Statement

#000003780820000031 Filed on November 03, 2020

Income Statement

Concept	2020 Q4	2020 Q3	2019 Q3
Revenue	$270.0M	$273.0M	$314.0M
YoY Change	-11.76%	-13.06%	5.37%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization		$0.00	$13.00M
YoY Change		-100.0%	-47.37%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$36.00M	$46.00M	$84.00M
YoY Change	-55.0%	-45.24%	33.33%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$85.00M	$100.0M	$120.0M
YoY Change	-26.72%	-16.67%	-2.44%
Income Tax	$14.00M	$17.00M	$17.00M
% Of Pretax Income	16.47%	17.0%	14.17%
Net Earnings	$72.00M	$83.00M	$103.0M
YoY Change	-24.21%	-19.42%	1.98%
Net Earnings / Revenue	26.67%	30.4%	32.8%
Basic Earnings Per Share	$0.22	$0.25	$0.31
Diluted Earnings Per Share	$0.22	$0.25	$0.31
COMMON SHARES
Basic Shares Outstanding	322.6M shares	323.4M shares	325.0M shares
Diluted Shares Outstanding		325.7M shares	326.1M shares

Balance Sheet

Concept	2020 Q4	2020 Q3	2019 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$1.383B	$900.0M	$609.0M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$332.0M	$335.0M	$329.0M
YoY Change	-0.3%	1.82%	1.78%
Goodwill	$2.262B	$2.262B	$2.262B
YoY Change	0.0%	0.0%	0.55%
Intangibles	$54.00M	$57.00M	$71.00M
YoY Change	-19.4%	-19.72%	-11.57%
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$37.35B	$37.44B	$34.33B
YoY Change	7.91%	9.07%	5.25%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$134.0M	$124.0M	$131.0M
YoY Change	4.69%	-5.34%
Deferred Revenue
YoY Change
Short-Term Debt	$1.804B	$1.899B	$3.144B
YoY Change	-43.91%	-39.6%	-14.55%
Long-Term Debt Due	$121.0M	$114.0M	$106.0M
YoY Change	12.04%	7.55%	-7.02%
Total Short-Term Liabilities	$255.0M	$238.0M	$237.0M
YoY Change	8.05%	0.42%	107.89%
LONG-TERM LIABILITIES
Long-Term Debt	$695.0M	$697.0M	$405.0M
YoY Change	71.6%	72.1%	13.45%
Other Long-Term Liabilities	$240.0M	$234.0M	$301.0M
YoY Change	-8.4%	-22.26%	5.24%
Total Long-Term Liabilities	$935.0M	$931.0M	$706.0M
YoY Change	40.18%	31.87%	9.8%
TOTAL LIABILITIES
Total Short-Term Liabilities	$255.0M	$238.0M	$237.0M
Total Long-Term Liabilities	$935.0M	$931.0M	$706.0M
Total Liabilities	$32.40B	$32.49B	$29.51B
YoY Change	8.96%	10.1%	5.04%
SHAREHOLDERS EQUITY
Retained Earnings	$869.0M	$838.0M	$744.0M
YoY Change	8.9%	12.63%	43.94%
Common Stock	$4.090B	$4.087B	$4.065B
YoY Change	0.49%	0.54%	0.38%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$68.00M	$55.00M	$27.00M
YoY Change	151.85%	103.7%	25.73%
Treasury Stock Shares	6.428M shares	4.792M shares	2.228M shares
Shareholders Equity	$4.959B	$4.951B	$4.820B
YoY Change
Total Liabilities & Shareholders Equity	$37.35B	$37.44B	$34.33B
YoY Change	7.91%	9.07%	5.25%

Cashflow Statement

Concept	2020 Q4	2020 Q3	2019 Q3
OPERATING ACTIVITIES
Net Income	$72.00M	$83.00M	$103.0M
YoY Change	-24.21%	-19.42%	1.98%
Depreciation, Depletion And Amortization		$0.00	$13.00M
YoY Change		-100.0%	-47.37%
Cash From Operating Activities	$194.0M	$77.00M	$224.0M
YoY Change	59.02%	-65.63%	33.73%
INVESTING ACTIVITIES
Capital Expenditures	-$8.000M	-$13.00M	-$10.00M
YoY Change	-46.67%	30.0%	11.11%
Acquisitions
YoY Change
Other Investing Activities	$460.0M	$246.0M	-$364.0M
YoY Change	-233.33%	-167.58%	-13.54%
Cash From Investing Activities	$452.0M	$233.0M	-$374.0M
YoY Change	-225.56%	-162.3%	-13.0%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-163.0M	-341.0M	260.0M
YoY Change	-171.49%	-231.15%	-2.48%
NET CHANGE
Cash From Operating Activities	194.0M	77.00M	224.0M
Cash From Investing Activities	452.0M	233.0M	-374.0M
Cash From Financing Activities	-163.0M	-341.0M	260.0M
Net Change In Cash	483.0M	-31.00M	110.0M
YoY Change	-4930.0%	-128.18%	2519.05%
FREE CASH FLOW
Cash From Operating Activities	$194.0M	$77.00M	$224.0M
Capital Expenditures	-$8.000M	-$13.00M	-$10.00M
Free Cash Flow	$202.0M	$90.00M	$234.0M
YoY Change	47.45%	-61.54%	32.58%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Amendment Flag AmendmentFlag	false
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	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Entity Registrant Name EntityRegistrantName	FNB CORP/PA/
	dei	Entity Central Index Key EntityCentralIndexKey	0000037808
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
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	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2020-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	001-31940
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	PA
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	25-1255406
	dei	Entity Address Address Line1 EntityAddressAddressLine1	One North Shore Center,
	dei	Entity Address Address Line2 EntityAddressAddressLine2	12 Federal Street,
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	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	15212
	dei	City Area Code CityAreaCode	800
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	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2019Q3	fnb	Dividendson Nonmarketable Equity Securities DividendsonNonmarketableEquitySecurities	5000000	USD
	fnb	Dividendson Nonmarketable Equity Securities DividendsonNonmarketableEquitySecurities	10000000	USD
	fnb	Dividendson Nonmarketable Equity Securities DividendsonNonmarketableEquitySecurities	14000000	USD
CY2020Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	4000000	USD
CY2019Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	3000000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	11000000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	9000000	USD
CY2020Q3	us-gaap	Noninterest Income Other NoninterestIncomeOther	4000000	USD
CY2019Q3	us-gaap	Noninterest Income Other NoninterestIncomeOther	4000000	USD
	us-gaap	Noninterest Income Other NoninterestIncomeOther	6000000	USD
	us-gaap	Noninterest Income Other NoninterestIncomeOther	7000000	USD
CY2020Q3	us-gaap	Noninterest Income NoninterestIncome	80000000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	80000000	USD
	us-gaap	Noninterest Income NoninterestIncome	226000000	USD
	us-gaap	Noninterest Income NoninterestIncome	220000000	USD
CY2020Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	100000000	USD
CY2019Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	93000000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	298000000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	279000000	USD
CY2020Q3	us-gaap	Occupancy Net OccupancyNet	14000000	USD
CY2019Q3	us-gaap	Occupancy Net OccupancyNet	13000000	USD
	us-gaap	Occupancy Net OccupancyNet	49000000	USD
	us-gaap	Occupancy Net OccupancyNet	44000000	USD
CY2020Q3	us-gaap	Equipment Expense EquipmentExpense	17000000	USD
CY2019Q3	us-gaap	Equipment Expense EquipmentExpense	15000000	USD
	us-gaap	Equipment Expense EquipmentExpense	49000000	USD
	us-gaap	Equipment Expense EquipmentExpense	45000000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3000000	USD
CY2019Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4000000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	10000000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	11000000	USD
CY2020Q3	us-gaap	Professional Fees ProfessionalFees	16000000	USD
CY2019Q3	us-gaap	Professional Fees ProfessionalFees	16000000	USD
	us-gaap	Professional Fees ProfessionalFees	50000000	USD
	us-gaap	Professional Fees ProfessionalFees	47000000	USD
CY2020Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	4000000	USD
CY2019Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	6000000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	15000000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	18000000	USD
CY2020Q3	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	4000000	USD
CY2019Q3	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	4000000	USD
	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	12000000	USD
	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	10000000	USD
CY2020Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	22000000	USD
CY2019Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	27000000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	68000000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	65000000	USD
CY2020Q3	us-gaap	Noninterest Expense NoninterestExpense	180000000	USD
CY2019Q3	us-gaap	Noninterest Expense NoninterestExpense	178000000	USD
	us-gaap	Noninterest Expense NoninterestExpense	551000000	USD
	us-gaap	Noninterest Expense NoninterestExpense	519000000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	100000000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	120000000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	258000000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	355000000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17000000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	44000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	63000000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	83000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	103000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	214000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	292000000	USD
CY2020Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	2000000	USD
CY2019Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	2000000	USD
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	6000000	USD
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	6000000	USD
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	81000000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	101000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	208000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	286000000	USD
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.25
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.31
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.64
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.88
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.25
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.31
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.64
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.88
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	83000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	103000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	214000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	292000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-1000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	18000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	17000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-3000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	6000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	63000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	60000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	2000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-1000000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-9000000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-7000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	8000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-4000000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-32000000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-24000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-1000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	0	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-2000000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-4000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	0	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-7000000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	1000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	0	USD
CY2019Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	0	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	0	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	0	USD
CY2019Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	1000000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	1000000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	2000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	9000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	39000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	37000000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	92000000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	106000000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	253000000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	329000000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	4753000000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	106000000	USD
CY2019Q3	us-gaap	Preferred Stock Dividends Per Share Cash Paid PreferredStockDividendsPerShareCashPaid	18.13
CY2019Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	2000000	USD
CY2019Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.12
CY2019Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	40000000	USD
CY2019Q3	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	1000000	USD
CY2019Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2000000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	4820000000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	4897000000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	92000000	USD
CY2020Q3	us-gaap	Preferred Stock Dividends Per Share Cash Paid PreferredStockDividendsPerShareCashPaid	18.13
CY2020Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	2000000	USD
CY2020Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.12
CY2020Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	39000000	USD
CY2020Q3	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	1000000	USD
CY2020Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2000000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	4951000000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	4608000000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	329000000	USD
	us-gaap	Preferred Stock Dividends Per Share Cash Paid PreferredStockDividendsPerShareCashPaid	54.39
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	6000000	USD
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.36
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	118000000	USD
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	-1000000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	8000000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	4820000000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	4883000000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	253000000	USD
	us-gaap	Preferred Stock Dividends Per Share Cash Paid PreferredStockDividendsPerShareCashPaid	54.39
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	6000000	USD
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.36
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	118000000	USD
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	1000000	USD
	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	25000000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	13000000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	4951000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	214000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	292000000	USD
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	5000000	USD
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	33000000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	105000000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	37000000	USD
	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-24000000	USD
	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	36000000	USD
	us-gaap	Payments To Purchase Loans Held For Sale PaymentsToPurchaseLoansHeldForSale	1351000000	USD
	us-gaap	Payments To Purchase Loans Held For Sale PaymentsToPurchaseLoansHeldForSale	983000000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	1258000000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	984000000	USD
	fnb	Gain Loss On Sale Of Financing Receivables GainLossOnSaleOfFinancingReceivables	28000000	USD
	fnb	Gain Loss On Sale Of Financing Receivables GainLossOnSaleOfFinancingReceivables	17000000	USD
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-18000000	USD
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	8000000	USD
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-7000000	USD
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	2000000	USD
	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	6000000	USD
	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	5000000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	265000000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	234000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-81000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	137000000	USD
	fnb	Payments For Proceeds From Financing Receivables PaymentsForProceedsFromFinancingReceivables	2809000000	USD
	fnb	Payments For Proceeds From Financing Receivables PaymentsForProceedsFromFinancingReceivables	1200000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1168000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	395000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1429000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	543000000	USD
	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	163000000	USD
	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	264000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	469000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	323000000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	33000000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	31000000	USD
	fnb	Proceeds From Loans Sold Not Originated For Sale ProceedsFromLoansSoldNotOriginatedForSale	0	USD
	fnb	Proceeds From Loans Sold Not Originated For Sale ProceedsFromLoansSoldNotOriginatedForSale	262000000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1000000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	9000000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2274000000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-771000000	USD
	us-gaap	Increase Decrease In Demand Deposits IncreaseDecreaseInDemandDeposits	4753000000	USD
	us-gaap	Increase Decrease In Demand Deposits IncreaseDecreaseInDemandDeposits	1286000000	USD
	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-702000000	USD
	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-145000000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-1316000000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-984000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	322000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	947000000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	266000000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	232000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	25000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	14000000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	7000000	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	6000000	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	6000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	118000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	118000000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2656000000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	755000000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	301000000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	121000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	599000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	488000000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	900000000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	609000000	USD
	us-gaap	Nature Of Operations NatureOfOperations	<div style="margin-top:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">NATURE OF OPERATIONS</span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">F.N.B. Corporation, headquartered in Pittsburgh, Pennsylvania, is a diversified financial services company operating in seven states and the District of Columbia. Our market coverage spans several major metropolitan areas including: Pittsburgh, Pennsylvania; Baltimore, Maryland; Cleveland, Ohio; Washington, D.C.; and Charlotte, Raleigh, Durham and the Piedmont Triad (Winston-Salem, Greensboro and High Point) in North Carolina. As of September 30, 2020, we had 355 banking offices throughout Pennsylvania, Ohio, Maryland, West Virginia, North Carolina, South Carolina and Virginia. </span></div>We provide a full range of commercial banking, consumer banking and wealth management solutions through our subsidiary network which is led by our largest affiliate, FNBPA, founded in 1864. Commercial banking solutions include corporate banking, small business banking, investment real estate financing, government banking, business credit, capital markets and lease financing. Consumer banking provides a full line of consumer banking products and services, including deposit products, mortgage lending, consumer lending and a complete suite of mobile and online banking services. Wealth management services include asset management, private banking and insurance.
CY2020Q3	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	7	State
	fnb	Number Of Banking Offices NumberOfBankingOffices	355	Office
	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-top:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Use of Estimates</span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Our accounting and reporting policies conform with GAAP. The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the amounts reported in the Consolidated Financial Statements and accompanying Notes to Consolidated Financial Statements (unaudited). Actual results could materially differ from those estimates. Material estimates that are particularly susceptible to significant changes include the ACL, accounting for loans acquired in a business combination prior to January 1, 2020, fair value of financial instruments, goodwill and other intangible assets, income taxes and deferred tax assets.</span></div>
CY2020Q1	fnb	Financing Receivable Purchasedwith Credit Deterioration Amountat Purchase Price Included With Allowance For Credit Losses Adjustment FinancingReceivablePurchasedwithCreditDeteriorationAmountatPurchasePriceIncludedWithAllowanceForCreditLossesAdjustment	50300000	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	196000000	USD
CY2020Q1	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	3000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3006000000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	96000000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	1000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3101000000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3275000000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	24000000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	10000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3289000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	2966000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	106000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	0	USD
CY2020Q3	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3072000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	3275000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	42000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	12000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3305000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	343000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	343000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	142000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	143000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	107000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	108000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	41000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	41000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	69000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	69000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	144000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	148000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	93000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	93000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	979000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	1017000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	612000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	613000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Amortized Cost Basis HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	1306000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	1349000000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3006000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3101000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	2966000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3072000000	USD
CY2020Q3	fnb	Securities With Carrying Value Pledged To Secure Public Deposits Trust Deposits And For Other Purposes SecuritiesWithCarryingValuePledgedToSecurePublicDepositsTrustDepositsAndForOtherPurposes	5427000000	USD
CY2019Q4	fnb	Securities With Carrying Value Pledged To Secure Public Deposits Trust Deposits And For Other Purposes SecuritiesWithCarryingValuePledgedToSecurePublicDepositsTrustDepositsAndForOtherPurposes	4494000000	USD
CY2020Q3	us-gaap	Securities Held As Collateral At Fair Value SecuritiesHeldAsCollateralAtFairValue	390000000	USD
CY2019Q4	us-gaap	Securities Held As Collateral At Fair Value SecuritiesHeldAsCollateralAtFairValue	285000000	USD
CY2020Q3	fnb	Percentage Of Securities Held As Collateral At Fair Value PercentageOfSecuritiesHeldAsCollateralAtFairValue	0.959
CY2019Q4	fnb	Percentage Of Securities Held As Collateral At Fair Value PercentageOfSecuritiesHeldAsCollateralAtFairValue	0.728
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	4	Security
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	118000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	0	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	18	Security
CY2020Q3	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	50000.00	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	76000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	1000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	22	Security
CY2020Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	194000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	1000000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	32	Security
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	685000000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	4000000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	78	Security
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	712000000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	6000000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	110	Security
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	1397000000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	10000000	USD
CY2020Q3	us-gaap	Municipal Debt Securities At Carrying Value MunicipalDebtSecuritiesAtCarryingValue	1200000000	USD
CY2020Q3	fnb	Municipal Bonds Percent With Formal Credit Enhancement Insurance MunicipalBondsPercentWithFormalCreditEnhancementInsurance	0.63
	fnb	Debt Securities Heldtomaturity Provision Expense DebtSecuritiesHeldtomaturityProvisionExpense	10000.00	USD
CY2020Q3	fnb	Financing Receivable Accrued Interest Receivable FinancingReceivableAccruedInterestReceivable	64500000	USD
	fnb	Financing Receivable Purchasedwith Credit Deterioration Amountat Purchase Price Included With Allowance For Credit Losses Adjustment FinancingReceivablePurchasedwithCreditDeteriorationAmountatPurchasePriceIncludedWithAllowanceForCreditLossesAdjustment	50300000	USD
	us-gaap	Financing Receivable Purchased With Credit Deterioration Discount Premium FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium	110000000.0	USD
CY2020Q3	us-gaap	Notes Receivable Gross NotesReceivableGross	25689000000	USD
CY2019Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	23289000000	USD
CY2020Q3	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	7	State
	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	508000000	USD
CY2020Q2	fnb	Paycheck Protection Program Allocation Cares Act PaycheckProtectionProgramAllocationCARESAct	349000000000	USD
CY2020Q2	fnb	Paycheck Protection Program Additional Authorized Amount Cares Act PaycheckProtectionProgramAdditionalAuthorizedAmountCARESAct	320000000000	USD
CY2020Q2	fnb	Paycheck Protection Program Payment Deferral Period With Forgiveness Determination Cares Act PaycheckProtectionProgramPaymentDeferralPeriodWithForgivenessDeterminationCARESAct	P10M
CY2020Q3	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	6501000000	USD
CY2020Q3	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	4659000000	USD
CY2020Q3	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	3086000000	USD
CY2020Q3	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	2533000000	USD
CY2020Q3	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	1948000000	USD
CY2020Q3	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	4411000000	USD
CY2020Q3	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	2551000000	USD
CY2020Q3	us-gaap	Notes Receivable Gross NotesReceivableGross	25689000000	USD
CY2020Q3	fnb	Financing Receivable Short Term Modification Due To Unusual Or Infrequent Event FinancingReceivableShortTermModificationDueToUnusualOrInfrequentEvent	792000000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	94000000	USD
CY2019Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	56000000	USD
	fnb	Restructured Loans Receivable Returned To Performing Status RestructuredLoansReceivableReturnedToPerformingStatus	6900000	USD
CY2020Q3	fnb	Financing Receivable Pooled Allowance Restructured FinancingReceivablePooledAllowanceRestructured	4600000	USD
CY2019Q4	fnb	Financing Receivable Pooled Allowance Restructured FinancingReceivablePooledAllowanceRestructured	4100000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	36	Contract
CY2020Q3	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	4000000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	4000000	USD
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	147	Contract
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	18000000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	14000000	USD
CY2019Q3	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	31	Contract
CY2019Q3	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	2000000	USD
CY2019Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	2000000	USD
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	111	Contract
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	13000000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	11000000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	6	Contract
CY2020Q3	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	0	USD
	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	28	Contract
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	4000000	USD
CY2019Q3	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	3	Contract
CY2019Q3	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	0	USD
	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	12	Contract
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	1000000	USD
CY2020Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	365000000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	23000000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	4000000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	19000000	USD
CY2020Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	27000000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	373000000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	196000000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	46000000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	13000000	USD
	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	33000000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	105000000	USD
CY2020Q1	fnb	Financing Receivable Allowancefor Credit Loss Not Previously Recorded FinancingReceivableAllowanceforCreditLossNotPreviouslyRecorded	55000000	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses Period Increase Decrease FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	105000000	USD
CY2020Q2	fnb	Forecasted Macroeconomic Variables Percentage Of Contraction Gross Domestic Product ForecastedMacroeconomicVariablesPercentageOfContractionGrossDomesticProduct	0.070
CY2020Q2	fnb	Forecasted Macroeconomic Variables Percentage Of Increase Unemployment ForecastedMacroeconomicVariablesPercentageOfIncreaseUnemployment	0.10
CY2020Q3	fnb	Financing Receivable Allowancefor Credit Loss Net FinancingReceivableAllowanceforCreditLossNet	373000000.0	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Period Increase Decrease FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	177100000	USD
	fnb	Financing Receivable Allowancefor Credit Loss Period Increase Decrease Percentage FinancingReceivableAllowanceforCreditLossPeriodIncreaseDecreasePercentage	0.904
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses Period Increase Decrease FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	105300000	USD
CY2020Q3	fnb	Financing Receivable Allowancefor Credit Loss Ratio FinancingReceivableAllowanceforCreditLossRatio	0.0145
CY2020Q3	fnb	Provision For Credit Losses ProvisionForCreditLosses	27200000	USD
CY2020Q3	fnb	Financing Receivable Allowancefor Credit Loss Writeoff Net FinancingReceivableAllowanceforCreditLossWriteoffNet	19300000	USD
CY2019Q3	fnb	Financing Receivable Allowancefor Credit Loss Writeoff Net FinancingReceivableAllowanceforCreditLossWriteoffNet	6400000	USD
	fnb	Provision For Credit Losses ProvisionForCreditLosses	105200000	USD
	fnb	Financing Receivable Allowancefor Credit Loss Writeoff Net FinancingReceivableAllowanceforCreditLossWriteoffNet	33400000	USD
	fnb	Financing Receivable Allowancefor Credit Loss Writeoff Net FinancingReceivableAllowanceforCreditLossWriteoffNet	23000000.0	USD
CY2019Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	188000000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	9000000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	3000000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	6000000	USD
CY2019Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	12000000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	194000000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	180000000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	32000000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	9000000	USD
	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	23000000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	37000000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	194000000	USD
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	116600000	USD
CY2020Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	124200000	USD
CY2020Q3	fnb	Operating Lease Lease Notyet Commenced Expense OperatingLeaseLeaseNotyetCommencedExpense	28000000	USD
CY2020Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	7000000	USD
CY2019Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	6000000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	20000000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	20000000	USD
CY2020Q3	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1000000	USD
CY2019Q3	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1000000	USD
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1000000	USD
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1000000	USD
CY2020Q3	us-gaap	Variable Lease Cost VariableLeaseCost	1000000	USD
CY2019Q3	us-gaap	Variable Lease Cost VariableLeaseCost	1000000	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	3000000	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	3000000	USD
CY2020Q3	us-gaap	Lease Cost LeaseCost	9000000	USD
CY2019Q3	us-gaap	Lease Cost LeaseCost	8000000	USD
	us-gaap	Lease Cost LeaseCost	24000000	USD
	us-gaap	Lease Cost LeaseCost	24000000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	19000000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	19000000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	5000000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	22000000	USD
CY2020Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P9Y6M3D
CY2019Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P9Y9M10D
CY2020Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.028
CY2019Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.030
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	6000000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	24000000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	19000000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	15000000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	13000000	USD
CY2020Q3	fnb	Lessee Operating Lease Liability To Be Paid After Year Four LesseeOperatingLeaseLiabilityToBePaidAfterYearFour	67000000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	144000000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	20000000	USD
CY2020Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	124000000	USD
CY2020Q3	fnb	Proportional Amortization Method Qualified Affordable Housing Project Investments Other Assets ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsOtherAssets	67000000	USD
CY2019Q4	fnb	Proportional Amortization Method Qualified Affordable Housing Project Investments Other Assets ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsOtherAssets	55000000	USD
CY2020Q3	fnb	Equity Method Qualified Affordable Housing Project Investments Other Assets EquityMethodQualifiedAffordableHousingProjectInvestmentsOtherAssets	3000000	USD
CY2019Q4	fnb	Equity Method Qualified Affordable Housing Project Investments Other Assets EquityMethodQualifiedAffordableHousingProjectInvestmentsOtherAssets	5000000	USD
CY2020Q3	fnb	Qualified Affordable Housing Project Investments Other Assets QualifiedAffordableHousingProjectInvestmentsOtherAssets	70000000	USD
CY2019Q4	fnb	Qualified Affordable Housing Project Investments Other Assets QualifiedAffordableHousingProjectInvestmentsOtherAssets	60000000	USD
CY2020Q3	fnb	Qualified Affordable Housing Project Investments Unfunded Commitments QualifiedAffordableHousingProjectInvestmentsUnfundedCommitments	51000000	USD
CY2019Q4	fnb	Qualified Affordable Housing Project Investments Unfunded Commitments QualifiedAffordableHousingProjectInvestmentsUnfundedCommitments	60000000	USD
CY2020Q3	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	0	USD
CY2019Q3	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	0	USD
	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	1000000	USD
	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	1000000	USD
CY2020Q3	fnb	Proportional Amortization Method Qualified Affordable Housing Project Investments Amortization ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	2000000	USD
CY2019Q3	fnb	Proportional Amortization Method Qualified Affordable Housing Project Investments Amortization ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	2000000	USD
	fnb	Proportional Amortization Method Qualified Affordable Housing Project Investments Amortization ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	8000000	USD
	fnb	Proportional Amortization Method Qualified Affordable Housing Project Investments Amortization ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	6000000	USD
CY2020Q3	fnb	Amortization Method Qualified Affordable Housing Project Investments Low Income Housing Tax Credit AmortizationMethodQualifiedAffordableHousingProjectInvestmentsLowIncomeHousingTaxCredit	-3000000	USD
CY2019Q3	fnb	Amortization Method Qualified Affordable Housing Project Investments Low Income Housing Tax Credit AmortizationMethodQualifiedAffordableHousingProjectInvestmentsLowIncomeHousingTaxCredit	-3000000	USD
	fnb	Amortization Method Qualified Affordable Housing Project Investments Low Income Housing Tax Credit AmortizationMethodQualifiedAffordableHousingProjectInvestmentsLowIncomeHousingTaxCredit	-9000000	USD
	fnb	Amortization Method Qualified Affordable Housing Project Investments Low Income Housing Tax Credit AmortizationMethodQualifiedAffordableHousingProjectInvestmentsLowIncomeHousingTaxCredit	-7000000	USD
CY2020Q3	fnb	Amortization Method Qualified Affordable Housing Project Investments Other Tax Benefits Relatedto Tax Credit Investments AmortizationMethodQualifiedAffordableHousingProjectInvestmentsOtherTaxBenefitsRelatedtoTaxCreditInvestments	0	USD
CY2019Q3	fnb	Amortization Method Qualified Affordable Housing Project Investments Other Tax Benefits Relatedto Tax Credit Investments AmortizationMethodQualifiedAffordableHousingProjectInvestmentsOtherTaxBenefitsRelatedtoTaxCreditInvestments	0	USD
	fnb	Amortization Method Qualified Affordable Housing Project Investments Other Tax Benefits Relatedto Tax Credit Investments AmortizationMethodQualifiedAffordableHousingProjectInvestmentsOtherTaxBenefitsRelatedtoTaxCreditInvestments	-2000000	USD
	fnb	Amortization Method Qualified Affordable Housing Project Investments Other Tax Benefits Relatedto Tax Credit Investments AmortizationMethodQualifiedAffordableHousingProjectInvestmentsOtherTaxBenefitsRelatedtoTaxCreditInvestments	-1000000	USD
CY2020Q3	fnb	Amortization Method Qualified Affordable Housing Project Investments Provision For Income Tax AmortizationMethodQualifiedAffordableHousingProjectInvestmentsProvisionForIncomeTax	-1000000	USD
CY2019Q3	fnb	Amortization Method Qualified Affordable Housing Project Investments Provision For Income Tax AmortizationMethodQualifiedAffordableHousingProjectInvestmentsProvisionForIncomeTax	-1000000	USD
	fnb	Amortization Method Qualified Affordable Housing Project Investments Provision For Income Tax AmortizationMethodQualifiedAffordableHousingProjectInvestmentsProvisionForIncomeTax	-3000000	USD
	fnb	Amortization Method Qualified Affordable Housing Project Investments Provision For Income Tax AmortizationMethodQualifiedAffordableHousingProjectInvestmentsProvisionForIncomeTax	-2000000	USD
CY2020Q3	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	405000000	USD
CY2019Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	278000000	USD
CY2020Q3	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	1380000000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	2255000000	USD
CY2020Q3	us-gaap	Federal Funds Purchased FederalFundsPurchased	0	USD
CY2019Q4	us-gaap	Federal Funds Purchased FederalFundsPurchased	575000000	USD
CY2020Q3	fnb	Subordinated Notes Short Term SubordinatedNotesShortTerm	114000000	USD
CY2019Q4	fnb	Subordinated Notes Short Term SubordinatedNotesShortTerm	108000000	USD
CY2020Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	1899000000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	3216000000	USD
CY2020Q3	fnb	Shortterm Advances ShorttermAdvances	1400000000	USD
CY2020Q3	fnb	Shortterm Advances Percentage Bearing Fixed Interest Rate ShorttermAdvancesPercentageBearingFixedInterestRate	1.000
CY2019Q4	fnb	Shortterm Advances ShorttermAdvances	1500000000	USD
CY2019Q4	fnb	Shortterm Advances Percentage Bearing Fixed Interest Rate ShorttermAdvancesPercentageBearingFixedInterestRate	0.645
CY2020Q3	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	700000000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	935000000	USD
CY2020Q3	us-gaap	Senior Notes SeniorNotes	298000000	USD
CY2019Q4	us-gaap	Senior Notes SeniorNotes	0	USD
CY2020Q3	us-gaap	Subordinated Long Term Debt SubordinatedLongTermDebt	84000000	USD
CY2019Q4	us-gaap	Subordinated Long Term Debt SubordinatedLongTermDebt	90000000	USD
CY2020Q3	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	66000000	USD
CY2019Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	66000000	USD
CY2020Q3	us-gaap	Other Long Term Debt OtherLongTermDebt	249000000	USD
CY2019Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	249000000	USD
CY2020Q3	us-gaap	Long Term Debt LongTermDebt	1397000000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	1340000000	USD
CY2020Q3	fnb	Gain Loss On Extinguishment Of Debt And Related Hedge Termination Costs GainLossOnExtinguishmentOfDebtAndRelatedHedgeTerminationCosts	13300000	USD
CY2020Q3	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	558000000	USD
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CY2020Q3	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	547000000	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	0	USD
CY2020Q3	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	66000000	USD
CY2020Q3	us-gaap	Derivative Fair Value Of Derivative Asset Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral	3000000	USD
CY2020Q3	us-gaap	Derivative Fair Value Of Derivative Liability Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral	42000000	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral	1000000	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral	23000000	USD
CY2020Q3	us-gaap	Derivative Asset Not Subject To Master Netting Arrangement DerivativeAssetNotSubjectToMasterNettingArrangement	420000000	USD
CY2020Q3	us-gaap	Derivative Liability Not Subject To Master Netting Arrangement DerivativeLiabilityNotSubjectToMasterNettingArrangement	3000000	USD
CY2019Q4	us-gaap	Derivative Asset Not Subject To Master Netting Arrangement DerivativeAssetNotSubjectToMasterNettingArrangement	153000000	USD
CY2019Q4	us-gaap	Derivative Liability Not Subject To Master Netting Arrangement DerivativeLiabilityNotSubjectToMasterNettingArrangement	2000000	USD
CY2020Q3	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	12238000000	USD
CY2020Q3	us-gaap	Derivative Assets DerivativeAssets	423000000	USD
CY2020Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	45000000	USD
CY2019Q4	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	9558000000	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	154000000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	25000000	USD
	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	750000000	USD
	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	31000000	USD
	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	819000000	USD
	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	66000000	USD
CY2020Q3	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	300000	USD
CY2019Q4	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	100000	USD
CY2020Q3	us-gaap	Derivative Fair Value Of Derivative Asset Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral	3000000	USD
CY2020Q3	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	0	USD
CY2020Q3	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	3000000	USD
CY2020Q3	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	0	USD
CY2020Q3	us-gaap	Derivative Fair Value Of Derivative Liability Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral	42000000	USD
CY2020Q3	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	0	USD
CY2020Q3	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	42000000	USD
CY2020Q3	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	0	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral	1000000	USD
CY2019Q4	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	1000000	USD
CY2019Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	0	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral	23000000	USD
CY2019Q4	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	23000000	USD
CY2019Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	0	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	0	USD
CY2020Q3	fnb	Percentage Of Commitments To Extend Credit Dependent On Financial Condition PercentageOfCommitmentsToExtendCreditDependentOnFinancialCondition	0.755
CY2020Q3	fnb	Allowance For Credit Losses On Loan Commitments AllowanceForCreditLossesOnLoanCommitments	14800000	USD
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	5525700	shares
CY2020Q3	fnb	Share Based Compensation Arrangement By Share Based Payment Award Number Of Additional Shares Registered ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesRegistered	4640000	shares
	fnb	Increase Decrease In Stock Compensation Expense IncreaseDecreaseInStockCompensationExpense	5400000	USD
	fnb	Increase Decrease In Stock Compensation Expense Percentage IncreaseDecreaseInStockCompensationExpensePercentage	0.65
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	4322378	shares
CY2020Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	14000000	USD
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	29000000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Weighted Average Remaining Contractual Terms ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms	P1Y8M8D
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	207030	shares
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	8.42
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	397628	shares
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	8.10
CY2020Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	100000	USD
CY2020Q3	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	16000000	USD
CY2019Q3	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-3000000	USD
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CY2020Q3	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1000000	USD
CY2019Q3	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
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CY2020Q3	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	17000000	USD
CY2019Q3	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-3000000	USD
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	68000000	USD
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	27000000	USD
CY2020Q3	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	0	USD
CY2019Q3	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	19000000	USD
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CY2020Q3	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
CY2019Q3	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1000000	USD
	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
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CY2020Q3	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	0	USD
CY2019Q3	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	20000000	USD
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	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	36000000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17000000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	44000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	63000000	USD
CY2020Q3	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019Q3	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.170
CY2019Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.145
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CY2020Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.170
CY2019Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.145
CY2020Q3	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	52600000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	25100000	USD
	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	32000000	USD
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CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	83000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	103000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	214000000	USD
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CY2020Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	2000000	USD
CY2019Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	2000000	USD
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CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	81000000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	101000000	USD
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	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	286000000	USD
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	323379720	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	325031140	shares
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CY2020Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	2283060	shares
CY2019Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1068730	shares
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CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	325662780	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	326099870	shares
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	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	325769161	shares
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.25
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.31
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CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.25
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CY2020Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	44755	shares
CY2019Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1	shares
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	us-gaap	Income Taxes Paid IncomeTaxesPaid	40000000	USD
	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	2000000	USD
	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	5000000	USD
	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	508000000	USD
	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	389000000	USD
	fnb	Transfer Of Loans To Portfolio Loans From Held For Sale TransferOfLoansToPortfolioLoansFromHeldForSale	0	USD
	fnb	Transfer Of Loans To Portfolio Loans From Held For Sale TransferOfLoansToPortfolioLoansFromHeldForSale	110000000	USD
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	Segment
CY2020Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	273000000	USD
CY2020Q3	us-gaap	Interest Expense InterestExpense	46000000	USD
CY2020Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	227000000	USD
CY2020Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	27000000	USD
CY2020Q3	us-gaap	Noninterest Income NoninterestIncome	80000000	USD
CY2020Q3	fnb	Non Interest Expense Excluding Amortization Of Intangibles NonInterestExpenseExcludingAmortizationOfIntangibles	177000000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3000000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17000000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	83000000	USD
CY2020Q3	us-gaap	Assets Assets	37441000000	USD
CY2020Q3	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	2319000000	USD
CY2019Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	314000000	USD
CY2019Q3	us-gaap	Interest Expense InterestExpense	84000000	USD
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	230000000	USD
CY2019Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	12000000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	80000000	USD
CY2019Q3	fnb	Non Interest Expense Excluding Amortization Of Intangibles NonInterestExpenseExcludingAmortizationOfIntangibles	174000000	USD
CY2019Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4000000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	103000000	USD
CY2019Q3	us-gaap	Assets Assets	34329000000	USD
CY2019Q3	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	2333000000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	860000000	USD
	us-gaap	Interest Expense InterestExpense	172000000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	688000000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	105000000	USD
	us-gaap	Noninterest Income NoninterestIncome	226000000	USD
	fnb	Non Interest Expense Excluding Amortization Of Intangibles NonInterestExpenseExcludingAmortizationOfIntangibles	541000000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	10000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	44000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	214000000	USD
CY2020Q3	us-gaap	Assets Assets	37441000000	USD
CY2020Q3	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	2319000000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	941000000	USD
	us-gaap	Interest Expense InterestExpense	250000000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	691000000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	37000000	USD
	us-gaap	Noninterest Income NoninterestIncome	220000000	USD
	fnb	Non Interest Expense Excluding Amortization Of Intangibles NonInterestExpenseExcludingAmortizationOfIntangibles	508000000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	11000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	63000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	292000000	USD
CY2019Q3	us-gaap	Assets Assets	34329000000	USD
CY2019Q3	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	2333000000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	0	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	0	USD
CY2020Q3	fnb	Impaired Loans Fair Value Disclosure ImpairedLoansFairValueDisclosure	25400000	USD
	fnb	Provision For Loan And Lease Losses Fair Value Disclosure ProvisionForLoanAndLeaseLossesFairValueDisclosure	32000000.0	USD
CY2020Q3	fnb	Other Real Estate Fair Value Disclosure OtherRealEstateFairValueDisclosure	10400000	USD
	fnb	Other Real Estate Owned Written Down Value OtherRealEstateOwnedWrittenDownValue	9200000	USD
	fnb	Gains Losses Included In Earnings On Non Recurring Assets Write Down GainsLossesIncludedInEarningsOnNonRecurringAssetsWriteDown	1200000	USD

Files In Submission

Name	View Source	Status
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0000037808-20-000031-index.html	Edgar Link	pending
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FNB CORP/PA/ Stock $fnb

2020 Q4 Form 10-Q Financial Statement

#000003780820000031 Filed on November 03, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FNB FNB CORP/PA/ Stock $fnb

2020 Q4 Form 10-Q Financial Statement

#000003780820000031 Filed on November 03, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FNB
FNB CORP/PA/ Stock $fnb