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Investment Securities (Summary Of Investment Securities) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Amortized Cost $ 18,139 $ 19,541
Gross Unrealized Gains 0 0
Gross Unrealized Losses 2,253 2,672
Fair Value 15,886 16,869
U.S. Treasury securities    
Schedule of Investments [Line Items]    
Amortized Cost 1,197 1,681
Gross Unrealized Gains 0 0
Gross Unrealized Losses 28 76
Fair Value 1,169 1,605
Residential mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost [1] 11,677 12,607
Gross Unrealized Gains [1] 0 0
Gross Unrealized Losses [1] 1,852 2,088
Fair Value [1] 9,825 10,519
Commercial mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost [1] 5,265 5,253
Gross Unrealized Gains [1] 0 0
Gross Unrealized Losses [1] 373 508
Fair Value [1] $ 4,892 $ 4,745
[1] Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.