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Investment Securities (Summary Of Investment Securities) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Amortized Cost $ 18,610 $ 19,541
Gross Unrealized Gains 0 0
Gross Unrealized Losses 2,954 2,672
Fair Value 15,656 16,869
U.S. Treasury securities    
Schedule of Investments [Line Items]    
Amortized Cost 1,354 1,681
Gross Unrealized Gains 0 0
Gross Unrealized Losses 50 76
Fair Value 1,304 1,605
Residential mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost [1] 12,005 12,607
Gross Unrealized Gains [1] 0 0
Gross Unrealized Losses [1] 2,327 2,088
Fair Value [1] 9,678 10,519
Commercial mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost [1] 5,251 5,253
Gross Unrealized Gains [1] 0 0
Gross Unrealized Losses [1] 577 508
Fair Value [1] $ 4,674 $ 4,745
[1] Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.