v3.26.1
Debt Securities (Schedule Of Cost And Estimated Fair Value Of Securities Available For Sale And Securities Held To Maturity By Contractual Maturity) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Debt Securities held to maturity, amortized cost $ 6,277 $ 6,473
Debt Securities held to maturity, estimated fair value 5,374 5,584
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost 324  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value 321  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost 1,844  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 1,817  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost 1,171  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value 1,157  
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost 70  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value 68  
Debt securities, amortized cost 28,145 28,134
Debt securities available for sale 27,419 27,560
Residential agency    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities held to maturity, amortized cost 5,972 6,103
Debt Securities held to maturity, estimated fair value 5,074 5,221
Debt securities, amortized cost 18,172 18,820
Debt securities available for sale 17,634 18,387
Commercial agency    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities held to maturity, amortized cost 305 370
Debt Securities held to maturity, estimated fair value 300 363
Debt securities, amortized cost 6,474 5,925
Debt securities available for sale 6,340 5,829
Commercial non-agency    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, amortized cost 90 91
Debt securities available for sale $ 82 $ 82