v3.26.1
Derivative Financial Instruments And Hedging Activities (Schedule Of Derivative Instruments Notional And Fair Values) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 173,810 $ 171,138
Derivative Asset, Estimated Fair Value 1,570 1,335
Derivative Liability, Estimated Fair Value 1,769 1,445
Derivative Asset, Fair Value of Derivative Contracts Offset in Accordance with Entity's Policy that were Offset Under Master Netting Agreements 1,269 1,120
Derivative Liability, Fair Value of Derivative Contracts Offset In Accordance with Policy Election that were Offset Under Master Netting Agreements 1,276 964
Derivative Asset 301 215
Derivative Liability 493 481
Derivative Asset, Collateral, Obligation to Return Cash, Offset 32 83
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 202 123
Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 49,550 49,985
Derivative Asset, Estimated Fair Value 88 105
Derivative Liability, Estimated Fair Value 346 270
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 124,260 121,153
Derivative Asset, Estimated Fair Value 1,482 1,230
Derivative Liability, Estimated Fair Value 1,423 1,175
Interest rate swaps | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 94,028 93,891
Derivative Asset, Estimated Fair Value 997 1,023
Derivative Liability, Estimated Fair Value 972 996
Interest rate options | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 11,748 10,674
Derivative Asset, Estimated Fair Value 17 14
Derivative Liability, Estimated Fair Value 11 6
Interest rate futures and forward commitments | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 1,682 1,537
Derivative Asset, Estimated Fair Value 11 8
Derivative Liability, Estimated Fair Value 3 1
Other contracts | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 16,802 15,051
Derivative Asset, Estimated Fair Value 457 185
Derivative Liability, Estimated Fair Value 437 172
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 8,502 8,067
Derivative Asset, Estimated Fair Value 38 23
Derivative Liability, Estimated Fair Value 60 73
Cash Flow Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 41,048 41,918
Derivative Asset, Estimated Fair Value 50 82
Derivative Liability, Estimated Fair Value 286 197
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 39,048 39,918
Derivative Asset, Estimated Fair Value 47 80
Derivative Liability, Estimated Fair Value 284 196
Cash Flow Hedging | Interest rate options | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 2,000 2,000
Derivative Asset, Estimated Fair Value 3 2
Derivative Liability, Estimated Fair Value $ 2 $ 1