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Derivative Financial Instruments And Hedging Activities (Schedule Of Derivative Instruments Notional And Fair Values) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 163,738 $ 160,576
Derivative Asset, Estimated Fair Value 1,816 2,105
Derivative Liability, Estimated Fair Value 2,551 2,691
Derivative Asset, Fair Value of Derivative Contracts Offset in Accordance with Entity's Policy that were Offset Under Master Netting Agreements 1,703 2,029
Derivative Liability, Fair Value of Derivative Contracts Offset In Accordance with Policy Election that were Offset Under Master Netting Agreements 1,615 1,560
Derivative Asset 113 76
Derivative Liability 936 1,131
Derivative Asset, Collateral, Obligation to Return Cash, Offset 106 243
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 87 43
Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 44,144 34,525
Derivative Asset, Estimated Fair Value 30 65
Derivative Liability, Estimated Fair Value 819 714
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 119,594 126,051
Derivative Asset, Estimated Fair Value 1,786 2,040
Derivative Liability, Estimated Fair Value 1,732 1,977
Interest rate swaps | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 94,803 99,892
Interest rate swaps | Not Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 1,608 1,769
Interest rate swaps | Not Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 1,598 1,718
Interest rate options | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 11,005 13,497
Interest rate options | Not Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 31 66
Interest rate options | Not Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 24 57
Interest rate futures and forward commitments | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 1,247 655
Interest rate futures and forward commitments | Not Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 8 7
Interest rate futures and forward commitments | Not Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 4 12
Other contracts | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 12,539 12,007
Other contracts | Not Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 139 198
Other contracts | Not Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 106 190
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 5,484 2,975
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 26 1
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 95 121
Cash Flow Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 38,660 31,550
Derivative Asset, Estimated Fair Value 4 64
Derivative Liability, Estimated Fair Value 724 593
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 36,660 29,550
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 0 43
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 718 580
Cash Flow Hedging | Interest rate options | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 2,000 2,000
Cash Flow Hedging | Interest rate options | Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 4 21
Cash Flow Hedging | Interest rate options | Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value $ 6 $ 13