$FNB
FNB CORP/PA/ Stock $fnb

$fnb Overview Financials Valuation SEC Filings Company Website

2020 Q2 Form 10-Q Financial Statement

#000003780820000022 Filed on August 05, 2020

Income Statement

Concept	2020 Q2	2019 Q2	2019 Q1
Revenue	$281.0M	$317.0M	$310.0M
YoY Change	-11.36%	7.82%	13.55%
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	$1.000M	$13.00M	$7.000M
YoY Change	-92.31%	-61.42%	-70.46%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$52.00M	$87.00M	$79.00M
YoY Change	-40.23%	61.11%	68.09%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$100.0M	$119.0M	$116.0M
YoY Change	-15.97%	12.26%	7.41%
Income Tax	$16.00M	$24.00M	$22.00M
% Of Pretax Income	16.0%	20.17%	18.97%
Net Earnings	$84.00M	$95.00M	$94.00M
YoY Change	-11.58%	11.76%	8.05%
Net Earnings / Revenue	29.89%	29.97%	30.32%
Basic Earnings Per Share	$0.25	$0.29	$0.28
Diluted Earnings Per Share	$0.25	$0.29	$0.28
COMMON SHARES
Basic Shares Outstanding	323.3M shares	325.0M shares	324.6M shares
Diluted Shares Outstanding	325.2M shares	325.9M shares	325.8M shares

Balance Sheet

Concept	2020 Q2	2019 Q2	2019 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$931.0M	$499.0M	$497.0M
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	$328.0M	$329.0M
YoY Change	1.22%	1.03%	-1.33%
Goodwill	$2.262B	$2.262B	$2.255B
YoY Change	0.0%	0.47%	0.17%
Intangibles	$61.00M	$74.00M	$75.00M
YoY Change	-17.57%	-12.01%	-14.63%
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	$37.72B	$33.90B	$33.70B
YoY Change	11.26%	5.1%	6.45%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$128.0M	$118.0M	$121.0M
YoY Change	8.47%
Deferred Revenue
YoY Change
Short-Term Debt	$2.411B	$3.711B	$4.111B
YoY Change	-35.03%	-14.38%	8.11%
Long-Term Debt Due	$112.0M	$108.0M	$110.0M
YoY Change	3.7%	-16.28%	-19.71%
Total Short-Term Liabilities	$240.0M	$226.0M	$231.0M
YoY Change	6.19%	75.19%	68.61%
LONG-TERM LIABILITIES
Long-Term Debt	$700.0M	$403.0M	$438.0M
YoY Change	73.7%	12.26%	21.67%
Other Long-Term Liabilities	$260.0M	$252.0M	$228.0M
YoY Change	3.17%	-10.32%	-11.97%
Total Long-Term Liabilities	$960.0M	$655.0M	$666.0M
YoY Change	46.56%	2.34%	7.59%
TOTAL LIABILITIES
Total Short-Term Liabilities	$240.0M	$226.0M	$231.0M
Total Long-Term Liabilities	$960.0M	$655.0M	$666.0M
Total Liabilities	$32.82B	$29.15B	$29.02B
YoY Change	12.6%	4.92%	6.6%
SHAREHOLDERS EQUITY
Retained Earnings	$796.0M	$683.0M	$629.0M
YoY Change	16.54%	49.35%	52.17%
Common Stock	$4.084B	$4.060B	$4.055B
YoY Change	0.59%	0.34%	0.34%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$55.00M	$25.00M	$23.00M
YoY Change	120.0%	16.46%	20.12%
Treasury Stock Shares	4.791M shares	2.055M shares	1.935M shares
Shareholders Equity	$4.897B	$4.753B	$4.680B
YoY Change
Total Liabilities & Shareholders Equity	$37.72B	$33.90B	$33.70B
YoY Change	11.26%	5.1%	6.45%

Cashflow Statement

Concept	2020 Q2	2019 Q2	2019 Q1
OPERATING ACTIVITIES
Net Income	$84.00M	$95.00M	$94.00M
YoY Change	-11.58%	11.76%	8.05%
Depreciation, Depletion And Amortization	$1.000M	$13.00M	$7.000M
YoY Change	-92.31%	-61.42%	-70.46%
Cash From Operating Activities	$47.00M	-$104.0M	$17.00M
YoY Change	-145.19%	-174.87%	-91.9%
INVESTING ACTIVITIES
Capital Expenditures	-$12.00M	-$11.00M	$10.00M
YoY Change	9.09%	1000.0%	11.11%
Acquisitions
YoY Change
Other Investing Activities	-$2.243B	$42.00M	-$418.0M
YoY Change	-5440.48%	-107.04%	-11.44%
Cash From Investing Activities	-$2.255B	$31.00M	-$428.0M
YoY Change	-7374.19%	-105.18%	-11.02%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			-$1.000M
YoY Change			-125.0%
Debt Paid & Issued, Net			$179.0M
YoY Change			894.44%
Cash From Financing Activities	2.575B	75.00M	$420.0M
YoY Change	3333.33%	-85.19%	135.96%
NET CHANGE
Cash From Operating Activities	47.00M	-104.0M	$17.00M
Cash From Investing Activities	-2.255B	31.00M	-$428.0M
Cash From Financing Activities	2.575B	75.00M	$420.0M
Net Change In Cash	367.0M	2.000M	$9.000M
YoY Change	18250.0%	-95.78%	-109.68%
FREE CASH FLOW
Cash From Operating Activities	$47.00M	-$104.0M	$17.00M
Capital Expenditures	-$12.00M	-$11.00M	$10.00M
Free Cash Flow	$59.00M	-$93.00M	$7.000M
YoY Change	-163.44%	-166.48%	-96.52%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q2
	dei	Entity Registrant Name EntityRegistrantName	FNB CORP/PA/
	dei	Entity Central Index Key EntityCentralIndexKey	0000037808
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020Q2	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilities
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2020-06-30
	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,
	dei	Entity Address City Or Town EntityAddressCityOrTown	Pittsburgh,
	dei	Entity Address State Or Province EntityAddressStateOrProvince	PA
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	15212
	dei	City Area Code CityAreaCode	800
	dei	Local Phone Number LocalPhoneNumber	555-5455
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
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CY2020Q2	us-gaap	Noninterest Income Other NoninterestIncomeOther	1000000	USD
CY2019Q2	us-gaap	Noninterest Income Other NoninterestIncomeOther	2000000	USD
	us-gaap	Noninterest Income Other NoninterestIncomeOther	2000000	USD
	us-gaap	Noninterest Income Other NoninterestIncomeOther	3000000	USD
CY2020Q2	us-gaap	Noninterest Income NoninterestIncome	77000000	USD
CY2019Q2	us-gaap	Noninterest Income NoninterestIncome	75000000	USD
	us-gaap	Noninterest Income NoninterestIncome	146000000	USD
	us-gaap	Noninterest Income NoninterestIncome	140000000	USD
CY2020Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	94000000	USD
CY2019Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	95000000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	198000000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	186000000	USD
CY2020Q2	us-gaap	Occupancy Net OccupancyNet	14000000	USD
CY2019Q2	us-gaap	Occupancy Net OccupancyNet	16000000	USD
	us-gaap	Occupancy Net OccupancyNet	35000000	USD
	us-gaap	Occupancy Net OccupancyNet	31000000	USD
CY2020Q2	us-gaap	Equipment Expense EquipmentExpense	16000000	USD
CY2019Q2	us-gaap	Equipment Expense EquipmentExpense	15000000	USD
	us-gaap	Equipment Expense EquipmentExpense	32000000	USD
	us-gaap	Equipment Expense EquipmentExpense	30000000	USD
CY2020Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4000000	USD
CY2019Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3000000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7000000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7000000	USD
CY2020Q2	us-gaap	Professional Fees ProfessionalFees	17000000	USD
CY2019Q2	us-gaap	Professional Fees ProfessionalFees	16000000	USD
	us-gaap	Professional Fees ProfessionalFees	34000000	USD
	us-gaap	Professional Fees ProfessionalFees	31000000	USD
CY2020Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	5000000	USD
CY2019Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	6000000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	11000000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	12000000	USD
CY2020Q2	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	4000000	USD
CY2019Q2	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	3000000	USD
	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	8000000	USD
	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	6000000	USD
CY2020Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	22000000	USD
CY2019Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	21000000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	46000000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	38000000	USD
CY2020Q2	us-gaap	Noninterest Expense NoninterestExpense	176000000	USD
CY2019Q2	us-gaap	Noninterest Expense NoninterestExpense	175000000	USD
	us-gaap	Noninterest Expense NoninterestExpense	371000000	USD
	us-gaap	Noninterest Expense NoninterestExpense	341000000	USD
CY2020Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	100000000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	119000000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	158000000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	235000000	USD
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16000000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	24000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	27000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	46000000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	84000000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	95000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	131000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	189000000	USD
CY2020Q2	us-gaap	Dividends Preferred Stock DividendsPreferredStock	2000000	USD
CY2019Q2	us-gaap	Dividends Preferred Stock DividendsPreferredStock	2000000	USD
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	4000000	USD
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	4000000	USD
CY2020Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	82000000	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	93000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	127000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	185000000	USD
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.25
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.29
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.39
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.57
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.25
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.29
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.39
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.57
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	84000000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	95000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	131000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	189000000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	4000000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	9000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	19000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	16000000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	13000000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	30000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	66000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	54000000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-1000000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-4000000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-11000000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-6000000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-5000000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-14000000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-40000000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-20000000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-1000000	USD
CY2019Q2	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	-1000000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	0	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-2000000	USD
CY2019Q2	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	-3000000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	1000000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	0	USD
CY2019Q2	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
CY2020Q2	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	0	USD
CY2019Q2	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	0	USD
CY2019Q2	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	-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	1000000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	10000000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	16000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	30000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	34000000	USD
CY2020Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	94000000	USD
CY2019Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	111000000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	161000000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	223000000	USD
CY2019Q1	us-gaap	Stockholders Equity StockholdersEquity	4680000000	USD
CY2019Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	111000000	USD
CY2019Q2	us-gaap	Preferred Stock Dividends Per Share Cash Paid PreferredStockDividendsPerShareCashPaid	18.13
CY2019Q2	us-gaap	Dividends Preferred Stock DividendsPreferredStock	2000000	USD
CY2019Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.12
CY2019Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	39000000	USD
CY2019Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4000000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	4753000000	USD
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	4842000000	USD
CY2020Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	94000000	USD
CY2020Q2	us-gaap	Preferred Stock Dividends Per Share Cash Paid PreferredStockDividendsPerShareCashPaid	18.13
CY2020Q2	us-gaap	Dividends Preferred Stock DividendsPreferredStock	2000000	USD
CY2020Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.12
CY2020Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	40000000	USD
CY2020Q2	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	0	USD
CY2020Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3000000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	4897000000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	4608000000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	223000000	USD
	us-gaap	Preferred Stock Dividends Per Share Cash Paid PreferredStockDividendsPerShareCashPaid	36.26
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	4000000	USD
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.24
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	78000000	USD
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	-2000000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6000000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	4753000000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	4883000000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	161000000	USD
	us-gaap	Preferred Stock Dividends Per Share Cash Paid PreferredStockDividendsPerShareCashPaid	36.26
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	4000000	USD
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.24
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	79000000	USD
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	0	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	11000000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	4897000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	131000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	189000000	USD
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	5000000	USD
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	20000000	USD
	fnb	Provision For Credit Losses ProvisionForCreditLosses	78000000	USD
	fnb	Provision For Credit Losses ProvisionForCreditLosses	25000000	USD
	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-24000000	USD
	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	16000000	USD
	us-gaap	Payments To Purchase Loans Held For Sale PaymentsToPurchaseLoansHeldForSale	772000000	USD
	us-gaap	Payments To Purchase Loans Held For Sale PaymentsToPurchaseLoansHeldForSale	577000000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	727000000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	556000000	USD
	fnb	Gain Loss On Sale Of Financing Receivables GainLossOnSaleOfFinancingReceivables	12000000	USD
	fnb	Gain Loss On Sale Of Financing Receivables GainLossOnSaleOfFinancingReceivables	10000000	USD
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-14000000	USD
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	12000000	USD
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-2000000	USD
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	6000000	USD
	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	4000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	11000000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	4000000	USD
	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	3000000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	299000000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	297000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-158000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-87000000	USD
	fnb	Payments For Proceeds From Financing Receivables PaymentsForProceedsFromFinancingReceivables	2778000000	USD
	fnb	Payments For Proceeds From Financing Receivables PaymentsForProceedsFromFinancingReceivables	782000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	425000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	175000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	492000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	302000000	USD
	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	86000000	USD
	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	36000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	309000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	209000000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	20000000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	21000000	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	4000000	USD
	fnb	Proceeds From Loans Sold Not Originated For Sale ProceedsFromLoansSoldNotOriginatedForSale	0	USD
	fnb	Proceeds From Loans Sold Not Originated For Sale ProceedsFromLoansSoldNotOriginatedForSale	110000000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1000000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	4000000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2507000000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-397000000	USD
	fnb	Increase Decrease In Non Interest Bearing Deposits Savings And Negotiable Order Of Withdrawal Accounts IncreaseDecreaseInNonInterestBearingDepositsSavingsAndNegotiableOrderOfWithdrawalAccounts	4071000000	USD
	fnb	Increase Decrease In Non Interest Bearing Deposits Savings And Negotiable Order Of Withdrawal Accounts IncreaseDecreaseInNonInterestBearingDepositsSavingsAndNegotiableOrderOfWithdrawalAccounts	61000000	USD
	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-462000000	USD
	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	217000000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-804000000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-418000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	314000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	940000000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	25000000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	227000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	25000000	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	4000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	79000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	78000000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2997000000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	495000000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	332000000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	11000000	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
CY2020Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	931000000	USD
CY2019Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	499000000	USD
	us-gaap	Nature Of Operations NatureOfOperations	<div style="margin-top:12pt;"><span style="background-color:rgb(255,255,255, 0.0);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="background-color:rgb(255,255,255, 0.0);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 June 30, 2020, we had 353 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.
CY2020Q2	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	7	State
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	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-top:12pt;"><span style="background-color:rgb(255,255,255, 0.0);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="background-color:rgb(255,255,255, 0.0);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
CY2020Q2	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	USD
CY2020Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3203000000	USD
CY2020Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	99000000	USD
CY2020Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	1000000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3301000000	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
CY2020Q2	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	3050000000	USD
CY2020Q2	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	112000000	USD
CY2020Q2	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	0	USD
CY2020Q2	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3162000000	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
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	346000000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	346000000	USD
CY2020Q2	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	123000000	USD
CY2020Q2	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	125000000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	120000000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	122000000	USD
CY2020Q2	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	54000000	USD
CY2020Q2	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	55000000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	71000000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	71000000	USD
CY2020Q2	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	123000000	USD
CY2020Q2	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	126000000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	80000000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	79000000	USD
CY2020Q2	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	966000000	USD
CY2020Q2	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	1004000000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	617000000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	618000000	USD
CY2020Q2	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Amortized Cost Basis HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	1266000000	USD
CY2020Q2	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	1310000000	USD
CY2020Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3203000000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3301000000	USD
CY2020Q2	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	3050000000	USD
CY2020Q2	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3162000000	USD
CY2020Q2	fnb	Securities With Carrying Value Pledged To Secure Public Deposits Trust Deposits And For Other Purposes SecuritiesWithCarryingValuePledgedToSecurePublicDepositsTrustDepositsAndForOtherPurposes	4778000000	USD
CY2019Q4	fnb	Securities With Carrying Value Pledged To Secure Public Deposits Trust Deposits And For Other Purposes SecuritiesWithCarryingValuePledgedToSecurePublicDepositsTrustDepositsAndForOtherPurposes	4494000000	USD
CY2020Q2	us-gaap	Securities Held As Collateral At Fair Value SecuritiesHeldAsCollateralAtFairValue	332000000	USD
CY2019Q4	us-gaap	Securities Held As Collateral At Fair Value SecuritiesHeldAsCollateralAtFairValue	285000000	USD
CY2020Q2	fnb	Percentage Of Securities Held As Collateral At Fair Value PercentageOfSecuritiesHeldAsCollateralAtFairValue	0.805
CY2019Q4	fnb	Percentage Of Securities Held As Collateral At Fair Value PercentageOfSecuritiesHeldAsCollateralAtFairValue	0.728
CY2020Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	8	Security
CY2020Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	88000000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	0	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	15	Security
CY2020Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	54000000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	1000000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	23	Security
CY2020Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	142000000	USD
CY2020Q2	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
CY2020Q2	us-gaap	Municipal Debt Securities At Carrying Value MunicipalDebtSecuritiesAtCarryingValue	1100000000	USD
CY2020Q2	fnb	Municipal Bonds Percent With Formal Credit Enhancement Insurance MunicipalBondsPercentWithFormalCreditEnhancementInsurance	0.63
	fnb	Debt Securities Heldtomaturity Provision Expense DebtSecuritiesHeldtomaturityProvisionExpense	10000.00	USD
CY2020Q2	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	60000.00	USD
CY2020Q2	fnb	Financing Receivable Accrued Interest Receivable FinancingReceivableAccruedInterestReceivable	65600000	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
CY2020Q2	us-gaap	Notes Receivable Gross NotesReceivableGross	26162000000	USD
CY2019Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	23289000000	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
	fnb	Paycheck Protection Program Payment Deferral Period With Forgiveness Determination Cares Act PaycheckProtectionProgramPaymentDeferralPeriodWithForgivenessDeterminationCARESAct	P10M
CY2020Q2	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	5251000000	USD
CY2020Q2	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	5086000000	USD
CY2020Q2	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	3595000000	USD
CY2020Q2	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	2811000000	USD
CY2020Q2	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	2079000000	USD
CY2020Q2	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	4644000000	USD
CY2020Q2	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	2696000000	USD
CY2020Q2	fnb	Financing Receivable Originatedand Revolving FinancingReceivableOriginatedandRevolving	26162000000	USD
CY2020Q2	fnb	Financing Receivable Short Term Modification Due To Unusual Or Infrequent Event FinancingReceivableShortTermModificationDueToUnusualOrInfrequentEvent	2400000000	USD
CY2020Q2	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	97000000	USD
CY2019Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	56000000	USD
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CY2020Q2	fnb	Financing Receivable Pooled Allowance Restructured FinancingReceivablePooledAllowanceRestructured	5000000.0	USD
CY2019Q4	fnb	Financing Receivable Pooled Allowance Restructured FinancingReceivablePooledAllowanceRestructured	4100000	USD
CY2020Q2	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	54	Contract
CY2020Q2	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	9000000	USD
CY2020Q2	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	8000000	USD
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	115	Contract
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	15000000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	13000000	USD
CY2019Q2	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	41	Contract
CY2019Q2	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	8000000	USD
CY2019Q2	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	8000000	USD
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	81	Contract
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	11000000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	10000000	USD
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	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	21	Contract
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	3000000	USD
CY2019Q2	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	Contract
CY2019Q2	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	0	USD
	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	6	Contract
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	0	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	343000000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Period Increase Decrease FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	169100000	USD
	fnb	Financing Receivable Allowancefor Credit Loss Period Increase Decrease Percentage FinancingReceivableAllowanceforCreditLossPeriodIncreaseDecreasePercentage	0.863
CY2020Q2	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	11000000	USD
CY2020Q2	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	3000000	USD
CY2020Q2	fnb	Financing Receivable Allowancefor Credit Loss Writeoff Net FinancingReceivableAllowanceforCreditLossWriteoffNet	8000000	USD
CY2020Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	30000000	USD
CY2020Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	365000000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	196000000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	23000000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	9000000	USD
	fnb	Financing Receivable Allowancefor Credit Loss Writeoff Net FinancingReceivableAllowanceforCreditLossWriteoffNet	14000000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	78000000	USD
CY2020Q1	fnb	Financing Receivable Allowancefor Credit Loss Not Previously Recorded FinancingReceivableAllowanceforCreditLossNotPreviouslyRecorded	55000000	USD
	us-gaap	Financing Receivable Allowance For Credit Loss Purchased With Credit Deterioration Increase FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease	50000000	USD
CY2020Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	365000000	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	0.120
CY2020Q2	fnb	Forecasted Macroeconomic Variables Percentage Of Increase Unemployment ForecastedMacroeconomicVariablesPercentageOfIncreaseUnemployment	0.11
CY2020Q2	fnb	Financing Receivable Allowancefor Credit Loss Net FinancingReceivableAllowanceforCreditLossNet	365000000.0	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses Period Increase Decrease FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	105300000	USD
CY2020Q2	fnb	Financing Receivable Allowancefor Credit Loss Ratio FinancingReceivableAllowanceforCreditLossRatio	0.0140
CY2020Q2	fnb	Provision For Credit Losses ProvisionForCreditLosses	30200000	USD
CY2020Q2	fnb	Provision For Credit Losses Incremental Provision Due To Covid19 ProvisionForCreditLossesIncrementalProvisionDueToCOVID19	17100000	USD
CY2020Q2	fnb	Financing Receivable Allowancefor Credit Loss Writeoff Net FinancingReceivableAllowanceforCreditLossWriteoffNet	8500000	USD
CY2019Q2	fnb	Financing Receivable Allowancefor Credit Loss Writeoff Net FinancingReceivableAllowanceforCreditLossWriteoffNet	9000000.0	USD
	fnb	Provision For Credit Losses ProvisionForCreditLosses	78000000.0	USD
	fnb	Provision For Credit Losses Incremental Provision Due To Covid19 ProvisionForCreditLossesIncrementalProvisionDueToCOVID19	55000000.0	USD
	fnb	Financing Receivable Allowancefor Credit Loss Writeoff Net FinancingReceivableAllowanceforCreditLossWriteoffNet	14200000	USD
	fnb	Financing Receivable Allowancefor Credit Loss Writeoff Net FinancingReceivableAllowanceforCreditLossWriteoffNet	16600000	USD
CY2019Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	186000000	USD
CY2019Q2	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	13000000	USD
CY2019Q2	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	4000000	USD
CY2019Q2	fnb	Financing Receivable Allowancefor Credit Loss Writeoff Net FinancingReceivableAllowanceforCreditLossWriteoffNet	9000000	USD
CY2019Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	11000000	USD
CY2019Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	188000000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	180000000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	23000000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	6000000	USD
	fnb	Financing Receivable Allowancefor Credit Loss Writeoff Net FinancingReceivableAllowanceforCreditLossWriteoffNet	17000000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	25000000	USD
CY2019Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	188000000	USD
CY2020Q2	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	120100000	USD
CY2020Q2	us-gaap	Operating Lease Liability OperatingLeaseLiability	127600000	USD
CY2020Q2	fnb	Operating Lease Lease Notyet Commenced Expense OperatingLeaseLeaseNotyetCommencedExpense	25000000	USD
CY2020Q2	us-gaap	Operating Lease Cost OperatingLeaseCost	6000000	USD
CY2019Q2	us-gaap	Operating Lease Cost OperatingLeaseCost	7000000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	13000000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	14000000	USD
CY2020Q2	us-gaap	Variable Lease Cost VariableLeaseCost	1000000	USD
CY2019Q2	us-gaap	Variable Lease Cost VariableLeaseCost	1000000	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	2000000	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	2000000	USD
CY2020Q2	us-gaap	Lease Cost LeaseCost	7000000	USD
CY2019Q2	us-gaap	Lease Cost LeaseCost	8000000	USD
	us-gaap	Lease Cost LeaseCost	15000000	USD
	us-gaap	Lease Cost LeaseCost	16000000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	13000000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	13000000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	4000000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	4000000	USD
CY2020Q2	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P9Y7M2D
CY2019Q2	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y8M23D
CY2020Q2	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.029
CY2019Q2	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.031
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	13000000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	23000000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	18000000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	14000000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	13000000	USD
CY2020Q2	fnb	Lessee Operating Lease Liability To Be Paid After Year Four LesseeOperatingLeaseLiabilityToBePaidAfterYearFour	67000000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	148000000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	20000000	USD
CY2020Q2	us-gaap	Operating Lease Liability OperatingLeaseLiability	128000000	USD
CY2020Q2	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
CY2020Q2	fnb	Equity Method Qualified Affordable Housing Project Investments Other Assets EquityMethodQualifiedAffordableHousingProjectInvestmentsOtherAssets	4000000	USD
CY2019Q4	fnb	Equity Method Qualified Affordable Housing Project Investments Other Assets EquityMethodQualifiedAffordableHousingProjectInvestmentsOtherAssets	5000000	USD
CY2020Q2	fnb	Qualified Affordable Housing Project Investments Other Assets QualifiedAffordableHousingProjectInvestmentsOtherAssets	71000000	USD
CY2019Q4	fnb	Qualified Affordable Housing Project Investments Other Assets QualifiedAffordableHousingProjectInvestmentsOtherAssets	60000000	USD
CY2020Q2	fnb	Qualified Affordable Housing Project Investments Unfunded Commitments QualifiedAffordableHousingProjectInvestmentsUnfundedCommitments	42000000	USD
CY2019Q4	fnb	Qualified Affordable Housing Project Investments Unfunded Commitments QualifiedAffordableHousingProjectInvestmentsUnfundedCommitments	60000000	USD
CY2020Q2	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	1000000	USD
CY2019Q2	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
	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	1000000	USD
CY2020Q2	fnb	Proportional Amortization Method Qualified Affordable Housing Project Investments Amortization ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	3000000	USD
CY2019Q2	fnb	Proportional Amortization Method Qualified Affordable Housing Project Investments Amortization ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	2000000	USD
	fnb	Proportional Amortization Method Qualified Affordable Housing Project Investments Amortization ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	6000000	USD
	fnb	Proportional Amortization Method Qualified Affordable Housing Project Investments Amortization ProportionalAmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	4000000	USD
CY2020Q2	fnb	Amortization Method Qualified Affordable Housing Project Investments Low Income Housing Tax Credit AmortizationMethodQualifiedAffordableHousingProjectInvestmentsLowIncomeHousingTaxCredit	-3000000	USD
CY2019Q2	fnb	Amortization Method Qualified Affordable Housing Project Investments Low Income Housing Tax Credit AmortizationMethodQualifiedAffordableHousingProjectInvestmentsLowIncomeHousingTaxCredit	-2000000	USD
	fnb	Amortization Method Qualified Affordable Housing Project Investments Low Income Housing Tax Credit AmortizationMethodQualifiedAffordableHousingProjectInvestmentsLowIncomeHousingTaxCredit	-6000000	USD
	fnb	Amortization Method Qualified Affordable Housing Project Investments Low Income Housing Tax Credit AmortizationMethodQualifiedAffordableHousingProjectInvestmentsLowIncomeHousingTaxCredit	-4000000	USD
CY2020Q2	fnb	Amortization Method Qualified Affordable Housing Project Investments Other Tax Benefits Relatedto Tax Credit Investments AmortizationMethodQualifiedAffordableHousingProjectInvestmentsOtherTaxBenefitsRelatedtoTaxCreditInvestments	-1000000	USD
CY2019Q2	fnb	Amortization Method Qualified Affordable Housing Project Investments Other Tax Benefits Relatedto Tax Credit Investments AmortizationMethodQualifiedAffordableHousingProjectInvestmentsOtherTaxBenefitsRelatedtoTaxCreditInvestments	-1000000	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
CY2020Q2	fnb	Amortization Method Qualified Affordable Housing Project Investments Provision For Income Tax AmortizationMethodQualifiedAffordableHousingProjectInvestmentsProvisionForIncomeTax	-1000000	USD
CY2019Q2	fnb	Amortization Method Qualified Affordable Housing Project Investments Provision For Income Tax AmortizationMethodQualifiedAffordableHousingProjectInvestmentsProvisionForIncomeTax	-1000000	USD
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	fnb	Amortization Method Qualified Affordable Housing Project Investments Provision For Income Tax AmortizationMethodQualifiedAffordableHousingProjectInvestmentsProvisionForIncomeTax	-1000000	USD
CY2020Q2	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	344000000	USD
CY2019Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	278000000	USD
CY2020Q2	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	1955000000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	2255000000	USD
CY2020Q2	us-gaap	Federal Funds Purchased FederalFundsPurchased	0	USD
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CY2020Q2	fnb	Subordinated Notes Short Term SubordinatedNotesShortTerm	112000000	USD
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CY2020Q2	us-gaap	Short Term Borrowings ShortTermBorrowings	2411000000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	3216000000	USD
CY2020Q2	fnb	Shortterm Advances ShorttermAdvances	1800000000	USD
CY2020Q2	fnb	Shortterm Advances Percentage Bearing Fixed Interest Rate ShorttermAdvancesPercentageBearingFixedInterestRate	0.898
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CY2019Q4	fnb	Shortterm Advances Percentage Bearing Fixed Interest Rate ShorttermAdvancesPercentageBearingFixedInterestRate	0.645
CY2020Q2	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	930000000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	935000000	USD
CY2020Q2	us-gaap	Senior Notes SeniorNotes	298000000	USD
CY2019Q4	us-gaap	Senior Notes SeniorNotes	0	USD
CY2020Q2	us-gaap	Subordinated Long Term Debt SubordinatedLongTermDebt	87000000	USD
CY2019Q4	us-gaap	Subordinated Long Term Debt SubordinatedLongTermDebt	90000000	USD
CY2020Q2	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
CY2020Q2	us-gaap	Other Long Term Debt OtherLongTermDebt	249000000	USD
CY2019Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	249000000	USD
CY2020Q2	us-gaap	Long Term Debt LongTermDebt	1630000000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	1340000000	USD
CY2020Q2	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	558000000	USD
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CY2020Q2	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	547000000	USD
CY2020Q2	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	66000000	USD
CY2020Q2	us-gaap	Derivative Fair Value Of Derivative Asset Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral	4000000	USD
CY2020Q2	us-gaap	Derivative Fair Value Of Derivative Liability Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral	44000000	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
CY2020Q2	us-gaap	Derivative Asset Not Subject To Master Netting Arrangement DerivativeAssetNotSubjectToMasterNettingArrangement	435000000	USD
CY2020Q2	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
CY2020Q2	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	11879000000	USD
CY2020Q2	us-gaap	Derivative Assets DerivativeAssets	439000000	USD
CY2020Q2	us-gaap	Derivative Liabilities DerivativeLiabilities	47000000	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
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	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	48000000	USD
CY2020Q2	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	300000	USD
CY2019Q4	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	100000	USD
CY2020Q2	us-gaap	Derivative Fair Value Of Derivative Asset Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral	4000000	USD
CY2020Q2	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	1000000	USD
CY2020Q2	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	3000000	USD
CY2020Q2	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	0	USD
CY2020Q2	us-gaap	Derivative Fair Value Of Derivative Liability Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral	44000000	USD
CY2020Q2	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	42000000	USD
CY2020Q2	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	2000000	USD
CY2020Q2	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 Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	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
CY2020Q2	fnb	Percentage Of Commitments To Extend Credit Dependent On Financial Condition PercentageOfCommitmentsToExtendCreditDependentOnFinancialCondition	0.719
CY2020Q2	fnb	Allowance For Credit Losses On Loan Commitments AllowanceForCreditLossesOnLoanCommitments	15100000	USD
CY2020Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	888422	shares
	fnb	Increase Decrease In Stock Compensation Expense IncreaseDecreaseInStockCompensationExpense	6200000	USD
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CY2020Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	4199443	shares
CY2020Q2	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	16000000	USD
CY2020Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	31000000	USD
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CY2020Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	212982	shares
CY2020Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	8.32
CY2019Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	411880	shares
CY2019Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	8.05
CY2020Q2	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	100000	USD
CY2020Q2	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	39000000	USD
CY2019Q2	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	9000000	USD
	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	46000000	USD
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CY2020Q2	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3000000	USD
CY2019Q2	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1000000	USD
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CY2020Q2	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	42000000	USD
CY2019Q2	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	10000000	USD
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	51000000	USD
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	30000000	USD
CY2020Q2	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-26000000	USD
CY2019Q2	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	13000000	USD
	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-24000000	USD
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CY2020Q2	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
CY2019Q2	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1000000	USD
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CY2020Q2	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-26000000	USD
CY2019Q2	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	14000000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-24000000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	16000000	USD
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16000000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	24000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	27000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	46000000	USD
CY2020Q2	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019Q2	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
CY2020Q2	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.160
CY2019Q2	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.197
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CY2020Q2	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	55000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	25100000	USD
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CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	84000000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	95000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	131000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	189000000	USD
CY2020Q2	us-gaap	Dividends Preferred Stock DividendsPreferredStock	2000000	USD
CY2019Q2	us-gaap	Dividends Preferred Stock DividendsPreferredStock	2000000	USD
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	4000000	USD
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CY2020Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	82000000	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	93000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	127000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	185000000	USD
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	323304237	shares
CY2019Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	324950162	shares
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	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	324796294	shares
CY2020Q2	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1848335	shares
CY2019Q2	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	999191	shares
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CY2020Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	325152572	shares
CY2019Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	325949353	shares
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CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.25
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CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.25
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CY2020Q2	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	40778	shares
CY2019Q2	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
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	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	Segment
CY2019Q2	fnb	Non Interest Expense Excluding Amortization Of Intangibles NonInterestExpenseExcludingAmortizationOfIntangibles	172000000	USD
CY2019Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3000000	USD
CY2020Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	281000000	USD
CY2020Q2	us-gaap	Interest Expense InterestExpense	52000000	USD
CY2020Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	229000000	USD
CY2020Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	30000000	USD
CY2020Q2	us-gaap	Noninterest Income NoninterestIncome	77000000	USD
CY2020Q2	fnb	Non Interest Expense Excluding Amortization Of Intangibles NonInterestExpenseExcludingAmortizationOfIntangibles	172000000	USD
CY2020Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4000000	USD
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16000000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	84000000	USD
CY2020Q2	us-gaap	Assets Assets	37721000000	USD
CY2020Q2	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	2323000000	USD
CY2019Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	317000000	USD
CY2019Q2	us-gaap	Interest Expense InterestExpense	87000000	USD
CY2019Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	230000000	USD
CY2019Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	11000000	USD
CY2019Q2	us-gaap	Noninterest Income NoninterestIncome	75000000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	24000000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	95000000	USD
CY2019Q2	us-gaap	Assets Assets	33903000000	USD
CY2019Q2	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	2336000000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	587000000	USD
	us-gaap	Interest Expense InterestExpense	126000000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	461000000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	78000000	USD
	us-gaap	Noninterest Income NoninterestIncome	146000000	USD
	fnb	Non Interest Expense Excluding Amortization Of Intangibles NonInterestExpenseExcludingAmortizationOfIntangibles	364000000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	27000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	131000000	USD
CY2020Q2	us-gaap	Assets Assets	37721000000	USD
CY2020Q2	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	2323000000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	627000000	USD
	us-gaap	Interest Expense InterestExpense	166000000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	461000000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	25000000	USD
	us-gaap	Noninterest Income NoninterestIncome	140000000	USD
	fnb	Non Interest Expense Excluding Amortization Of Intangibles NonInterestExpenseExcludingAmortizationOfIntangibles	334000000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	46000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	189000000	USD
CY2019Q2	us-gaap	Assets Assets	33903000000	USD
CY2019Q2	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	2336000000	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
CY2020Q2	fnb	Impaired Loans Fair Value Disclosure ImpairedLoansFairValueDisclosure	16800000	USD
	fnb	Provision For Loan And Lease Losses Fair Value Disclosure ProvisionForLoanAndLeaseLossesFairValueDisclosure	14000000.0	USD
CY2020Q2	fnb	Other Real Estate Fair Value Disclosure OtherRealEstateFairValueDisclosure	9700000	USD
	fnb	Other Real Estate Owned Written Down Value OtherRealEstateOwnedWrittenDownValue	8700000	USD
	fnb	Gains Losses Included In Earnings On Non Recurring Assets Write Down GainsLossesIncludedInEarningsOnNonRecurringAssetsWriteDown	1000000.0	USD

Files In Submission

Name	View Source	Status
0000037808-20-000022-index-headers.html	Edgar Link	pending
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0000037808-20-000022.txt	Edgar Link	pending
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2020 Q2 Form 10-Q Financial Statement

#000003780820000022 Filed on August 05, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FNB FNB CORP/PA/ Stock $fnb

2020 Q2 Form 10-Q Financial Statement

#000003780820000022 Filed on August 05, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FNB
FNB CORP/PA/ Stock $fnb