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Derivative Financial Instruments And Hedging Activities (Schedule Of Derivative Instruments Notional And Fair Values) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 161,027 $ 160,576
Derivative Asset, Estimated Fair Value 2,093 2,105
Derivative Liability, Estimated Fair Value 2,936 2,691
Derivative Asset, Fair Value of Derivative Contracts Offset in Accordance with Entity's Policy that were Offset Under Master Netting Agreements 2,014 2,029
Derivative Liability, Fair Value of Derivative Contracts Offset In Accordance with Policy Election that were Offset Under Master Netting Agreements 1,785 1,560
Derivative Asset 79 76
Derivative Liability 1,151 1,131
Derivative Asset, Collateral, Obligation to Return Cash, Offset 166 243
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 63 43
Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 37,805 34,525
Derivative Asset, Estimated Fair Value 16 65
Derivative Liability, Estimated Fair Value 929 714
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 123,222 126,051
Derivative Asset, Estimated Fair Value 2,077 2,040
Derivative Liability, Estimated Fair Value 2,007 1,977
Interest rate swaps | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 97,687 99,892
Interest rate swaps | Not Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 1,885 1,769
Interest rate swaps | Not Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 1,850 1,718
Interest rate options | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 12,412 13,497
Interest rate options | Not Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 61 66
Interest rate options | Not Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 49 57
Interest rate futures and forward commitments | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 1,296 655
Interest rate futures and forward commitments | Not Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 9 7
Interest rate futures and forward commitments | Not Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 2 12
Other contracts | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 11,827 12,007
Other contracts | Not Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 122 198
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 3,755 2,975
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 3 1
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 111 121
Cash Flow Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 34,050 31,550
Derivative Asset, Estimated Fair Value 13 64
Derivative Liability, Estimated Fair Value 818 593
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 32,050 29,550
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 5 43
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 810 580
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 8 21
Cash Flow Hedging | Interest rate options | Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value $ 8 $ 13