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Derivative Financial Instruments And Hedging Activities (Schedule Of Derivative Instruments Notional And Fair Values) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 169,475 $ 163,738
Derivative Asset, Estimated Fair Value 1,408 1,816
Derivative Liability, Estimated Fair Value 1,497 2,551
Derivative Asset, Fair Value of Derivative Contracts Offset in Accordance with Entity's Policy that were Offset Under Master Netting Agreements 1,171 1,703
Derivative Liability, Fair Value of Derivative Contracts Offset In Accordance with Policy Election that were Offset Under Master Netting Agreements 1,000 1,615
Derivative Asset 237 113
Derivative Liability 497 936
Derivative Asset, Collateral, Obligation to Return Cash, Offset (84) (106)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset (115) (87)
Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 45,951 44,144
Derivative Asset, Estimated Fair Value 146 30
Derivative Liability, Estimated Fair Value 312 819
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 123,524 119,594
Derivative Asset, Estimated Fair Value 1,262 1,786
Derivative Liability, Estimated Fair Value 1,185 1,732
Interest rate swaps | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 95,826 94,803
Interest rate swaps | Not Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 1,080 1,608
Interest rate swaps | Not Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 1,034 1,598
Interest rate options | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 11,211 11,005
Interest rate options | Not Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 19 31
Interest rate options | Not Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 8 24
Interest rate futures and forward commitments | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 1,682 1,247
Interest rate futures and forward commitments | Not Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 8 8
Interest rate futures and forward commitments | Not Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 3 4
Other contracts | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 14,805 12,539
Other contracts | Not Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 155 139
Other contracts | Not Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 140 106
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 7,533 5,484
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 10 26
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 97 95
Cash Flow Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 38,418 38,660
Derivative Asset, Estimated Fair Value 136 4
Derivative Liability, Estimated Fair Value 215 724
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 36,418 36,660
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Estimated Fair Value 133 0
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value 214 718
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 3 4
Cash Flow Hedging | Interest rate options | Designated as Hedging Instrument | Other Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Estimated Fair Value $ 1 $ 6