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
Jun. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Debt securities, amortized cost $ 28,167 $ 28,134
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 194 299
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (973) (873)
Available-for-sale debt securities, net carrying value 27,388 27,560
Debt securities available for sale 27,388 27,560
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities held to maturity, amortized cost 6,088 6,473
Held To Maturity Debt Securities Gross Unrealized Gains 0 0
Held To Maturity Debt Securities Gross Unrealized Losses (817) (867)
Debt Securities held to maturity 5,271 5,606
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain 1 37
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss (92) (59)
Debt Securities held to maturity, estimated fair value 5,180 5,584
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, amortized cost 2,057 2,313
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 12 10
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (30) (47)
Available-for-sale debt securities, net carrying value 2,039 2,276
Debt securities available for sale 2,039 2,276
Federal agency securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, amortized cost 539 544
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 3 6
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (10) (7)
Available-for-sale debt securities, net carrying value 532 543
Debt securities available for sale 532 543
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, amortized cost 2 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 2 2
Debt securities available for sale 2 2
Residential agency    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, amortized cost 18,288 18,820
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 156 244
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (750) (677)
Available-for-sale debt securities, net carrying value 17,694 18,387
Debt securities available for sale 17,694 18,387
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities held to maturity, amortized cost 5,822 6,103
Held To Maturity Debt Securities Gross Unrealized Gains 0 0
Held To Maturity Debt Securities Gross Unrealized Losses (817) (866)
Debt Securities held to maturity 5,005 5,237
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain 1 37
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss (87) (53)
Debt Securities held to maturity, estimated fair value 4,919 5,221
Commercial agency    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, amortized cost 6,684 5,925
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 21 34
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (171) (130)
Available-for-sale debt securities, net carrying value 6,534 5,829
Debt securities available for sale 6,534 5,829
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities held to maturity, amortized cost 266 370
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 266 369
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 261 363
Commercial non-agency    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, amortized cost 165 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 157 82
Debt securities available for sale 157 82
Corporate and other debt securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, amortized cost 432 439
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2 5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (4) (3)
Available-for-sale debt securities, net carrying value 430 441
Debt securities available for sale $ 430 $ 441