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Derivative Financial Instruments And Hedging Activities (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
AOCI before Tax, Attributable to Parent $ (4,325,000,000) $ (3,773,000,000) $ (3,812,000,000) $ (4,481,000,000)
Accumulated Other Comprehensive Income related to discontinued cash flow hedges, before tax 70,000,000      
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months (360,000,000)      
Pre-tax net income related to amortization of discontinued cash flow hedges 50,000,000      
Derivative, Notional Amount 162,623,000,000 160,576,000,000    
Maximum potential future exposure on swap participations 448,000,000      
Aggregate fair value of all derivative instruments with credit risk 40,000,000 29,000,000    
Posted collateral related to derivative instruments with credit risk 37,000,000 32,000,000    
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 (689,000,000) (399,000,000) $ (255,000,000) $ (468,000,000)
Not Designated as Hedging Instrument [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative, Notional Amount 126,588,000,000 126,051,000,000    
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative, Notional Amount 188,000,000 124,000,000    
Forward Sale Commitments [Member] | Not Designated as Hedging Instrument [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative, Notional Amount 363,000,000 267,000,000    
Forward Rate Commitments and Futures Contracts [Member] | Not Designated as Hedging Instrument [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative, Notional Amount $ 3,600,000,000 $ 3,300,000,000