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Derivative Financial Instruments And Hedging Activities (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
AOCI before Tax, Attributable to Parent $ (3,773,000,000) $ (4,481,000,000) $ 387,000,000 $ 1,759,000,000
Accumulated Other Comprehensive Income related to discontinued cash flow hedges, before tax 90,000,000      
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months (309,000,000)      
Pre-tax net income related to amortization of discontinued cash flow hedges 61,000,000      
Derivative, Notional Amount 160,576,000,000 151,907,000,000    
Maximum potential future exposure on swap participations 418,000,000      
Aggregate fair value of all derivative instruments with credit risk 29,000,000 17,000,000    
Posted collateral related to derivative instruments with credit risk 32,000,000 20,000,000    
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 (399,000,000) (468,000,000) $ 830,000,000 $ 1,610,000,000
Not Designated as Hedging Instrument [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative, Notional Amount 126,051,000,000 119,884,000,000    
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative, Notional Amount 124,000,000 118,000,000    
Forward Sale Commitments [Member] | Not Designated as Hedging Instrument [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative, Notional Amount 267,000,000 233,000,000    
Forward Rate Commitments and Futures Contracts [Member] | Not Designated as Hedging Instrument [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative, Notional Amount $ 3,300,000,000 $ 3,400,000,000