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Investment Securities (Summary Of Investment Securities) (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Amortized Cost $ 17,641 $ 17,918
Gross Unrealized Gains 5 1
Gross Unrealized Losses 2,544 2,874
Fair Value 15,102 15,045
U.S. Treasury securities    
Schedule of Investments [Line Items]    
Amortized Cost 1,282 1,277
Gross Unrealized Gains 5 1
Gross Unrealized Losses 0 1
Fair Value 1,287 1,277
Residential mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost [1] 11,109 11,380
Gross Unrealized Gains [1] 0 0
Gross Unrealized Losses [1] 2,087 2,304
Fair Value [1] 9,022 9,076
Commercial mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost [1] 5,250 5,261
Gross Unrealized Gains [1] 0 0
Gross Unrealized Losses [1] 457 569
Fair Value [1] $ 4,793 $ 4,692
[1] Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.