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Derivative Financial Instruments And Hedging Activities (Schedule Of Derivative Instruments Notional And Fair Values) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 165,240 $ 160,576
Derivative Asset, Estimated Fair Value 1,640 2,105
Derivative Liability, Estimated Fair Value 1,808 2,691
Derivative Asset, Fair Value of Derivative Contracts Offset in Accordance with Entity's Policy that were Offset Under Master Netting Agreements 1,434 2,029
Derivative Liability, Fair Value of Derivative Contracts Offset In Accordance with Policy Election that were Offset Under Master Netting Agreements 1,124 1,560
Derivative Asset 206 76
Derivative Liability 684 1,131
Derivative Asset, Collateral, Obligation to Return Cash, Offset 120 243
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 67 43
Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 39,234 34,525
Derivative Asset, Estimated Fair Value 117 65
Derivative Liability, Estimated Fair Value 398 714
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 126,006 126,051
Derivative Asset, Estimated Fair Value 1,523 2,040
Derivative Liability, Estimated Fair Value 1,410 1,977
Interest rate swaps | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 99,981 99,892
Interest rate swaps | Not Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 1,330 1,769
Interest rate swaps | Not Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 1,258 1,718
Interest rate options | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 12,151 13,497
Interest rate options | Not Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 40 66
Interest rate options | Not Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 27 57
Interest rate futures and forward commitments | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 1,376 655
Interest rate futures and forward commitments | Not Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 7 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 12,497 12,007
Other contracts | Not Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 146 198
Other contracts | Not Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 123 190
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 4,934 2,975
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 4 1
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 85 121
Cash Flow Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 34,300 31,550
Derivative Asset, Estimated Fair Value 113 64
Derivative Liability, Estimated Fair Value 313 593
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 32,300 29,550
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 101 43
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 307 580
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 12 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