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Investment Securities (Summary Of Investment Securities) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Amortized Cost $ 19,969 $ 22,045
Gross Unrealized Gains 0 0
Gross Unrealized Losses 3,646 3,033
Fair Value 16,323 19,012
U.S. Treasury securities    
Schedule of Investments [Line Items]    
Amortized Cost 1,788 2,810
Gross Unrealized Gains 0 0
Gross Unrealized Losses 107 146
Fair Value 1,681 2,664
Residential mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost 12,928 13,983
Gross Unrealized Gains 0 0
Gross Unrealized Losses 2,754 2,328
Fair Value 10,174 11,655
Commercial mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost 5,253 5,252
Gross Unrealized Gains 0 0
Gross Unrealized Losses 785 559
Fair Value $ 4,468 $ 4,693