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Derivative Financial Instruments And Hedging Activities (Narrative) (Details) - USD ($)
9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Pre-tax AOCI loss $ (2,540,000,000) $ (4,379,000,000) $ (3,773,000,000) $ (5,681,000,000) $ (4,613,000,000) $ (4,481,000,000)
Accumulated Other Comprehensive Income related to discontinued cash flow hedges, before tax 43,000,000          
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months (138,000,000)          
Pre-tax net income related to amortization of discontinued cash flow hedges 39,000,000          
Derivative, Notional Amount 165,240,000,000   160,576,000,000      
Maximum potential future exposure on swap participations 334,000,000          
Aggregate fair value of all derivative instruments with credit risk 45,000,000   29,000,000      
Posted collateral related to derivative instruments with credit risk 43,000,000   32,000,000      
Unrealized gains (losses) on derivative instruments designated as cash flow hedges:            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Pre-tax AOCI loss (118,000,000) $ (703,000,000) (399,000,000) $ (1,004,000,000) $ (719,000,000) $ (468,000,000)
Not Designated as Hedging Instrument            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Derivative, Notional Amount 126,006,000,000   126,051,000,000      
Interest Rate Lock Commitments | Not Designated as Hedging Instrument            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Derivative, Notional Amount 173,000,000   124,000,000      
Forward Sale Commitments | Not Designated as Hedging Instrument            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Derivative, Notional Amount 358,000,000   267,000,000      
Forward Rate Commitments and Futures Contracts | Not Designated as Hedging Instrument            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Derivative, Notional Amount $ 3,600,000,000   $ 3,300,000,000