v3.26.1
Debt Securities (Schedule Of Amortized Cost, Gross Unrealized Gains And Losses, And Estimated Fair Value Of Securities Available For Sale And Securities Held To Maturity) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Debt securities, amortized cost $ 28,145 $ 28,134
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 196 299
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (922) (873)
Available-for-sale debt securities, net carrying value 27,419 27,560
Debt securities available for sale 27,419 27,560
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities held to maturity, amortized cost 6,277 6,473
Held To Maturity Debt Securities Gross Unrealized Gains 0 0
Held To Maturity Debt Securities Gross Unrealized Losses (843) (867)
Debt Securities held to maturity 5,434 5,606
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain 13 37
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss (73) (59)
Debt Securities held to maturity, estimated fair value 5,374 5,584
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, amortized cost 2,386 2,313
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 8 10
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (49) (47)
Available-for-sale debt securities, net carrying value 2,345 2,276
Debt securities available for sale 2,345 2,276
Federal agency securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, amortized cost 541 544
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 4 6
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (8) (7)
Available-for-sale debt securities, net carrying value 537 543
Debt securities available for sale 537 543
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, amortized cost 1 2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0
Available-for-sale debt securities, net carrying value 1 2
Debt securities available for sale 1 2
Residential agency    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, amortized cost 18,172 18,820
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 164 244
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (702) (677)
Available-for-sale debt securities, net carrying value 17,634 18,387
Debt securities available for sale 17,634 18,387
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities held to maturity, amortized cost 5,972 6,103
Held To Maturity Debt Securities Gross Unrealized Gains 0 0
Held To Maturity Debt Securities Gross Unrealized Losses (843) (866)
Debt Securities held to maturity 5,129 5,237
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain 13 37
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss (68) (53)
Debt Securities held to maturity, estimated fair value 5,074 5,221
Commercial agency    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, amortized cost 6,474 5,925
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 17 34
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (151) (130)
Available-for-sale debt securities, net carrying value 6,340 5,829
Debt securities available for sale 6,340 5,829
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities held to maturity, amortized cost 305 370
Held To Maturity Debt Securities Gross Unrealized Gains 0 0
Held To Maturity Debt Securities Gross Unrealized Losses 0 (1)
Debt Securities held to maturity 305 369
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain 0 0
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss (5) (6)
Debt Securities held to maturity, estimated fair value 300 363
Commercial non-agency    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, amortized cost 90 91
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (8) (9)
Available-for-sale debt securities, net carrying value 82 82
Debt securities available for sale 82 82
Corporate and other debt securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, amortized cost 481 439
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 3 5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (4) (3)
Available-for-sale debt securities, net carrying value 480 441
Debt securities available for sale $ 480 $ 441