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Derivative Financial Instruments And Hedging Activities (Narrative) (Details) - USD ($)
6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months $ (391,000,000)          
Pre-tax net income related to amortization of discontinued cash flow hedges 37,000,000          
Derivative, Notional Amount 169,223,000,000   $ 151,907,000,000      
Maximum potential future exposure on swap participations 446,000,000          
Aggregate fair value of all derivative instruments with credit risk 25,000,000   17,000,000      
Posted collateral related to derivative instruments with credit risk 24,000,000   20,000,000      
AOCI before Tax, Attributable to Parent (4,613,000,000) $ (3,812,000,000) (4,481,000,000) $ (2,772,000,000) $ (1,629,000,000) $ 387,000,000
Accumulated Other Comprehensive Income related to discontinued cash flow hedges, before tax 98,000,000          
Accumulated Net Gain (Loss) from Derivative Instruments Designated as Cash Flow Hedges [Member]            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
AOCI before Tax, Attributable to Parent (719,000,000) $ (255,000,000) (468,000,000) $ 82,000,000 $ 303,000,000 $ 830,000,000
Not Designated as Hedging Instrument [Member]            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Derivative, Notional Amount 138,500,000,000   119,884,000,000      
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument [Member]            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Derivative, Notional Amount 182,000,000   118,000,000      
Forward Sale Commitments [Member] | Not Designated as Hedging Instrument [Member]            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Derivative, Notional Amount 396,000,000   233,000,000      
Forward Rate Commitments and Futures Contracts [Member] | Not Designated as Hedging Instrument [Member]            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Derivative, Notional Amount $ 3,500,000,000   $ 3,400,000,000