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Investment Securities (Summary Of Investment Securities In Unrealized Loss Positions) (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Temporarily Impaired Less than 12 Months, Fair Value $ 10 $ 8,504
Temporarily Impaired 12 Months or more, Fair Value 16,857 10,506
Temporarily Impaired, 12 Months or more, Unrealized Losses 2,672 2,262
Temporarily Impaired Total, Fair Value 16,867 19,010
Temporarily Impaired Total, Unrealized Losses 2,672 3,033
U.S. Treasury and other U.S. government agency securities    
Temporarily Impaired Less than 12 Months, Fair Value 0 996
Temporarily Impaired, Less than 12 Months, Unrealized Losses 0 5
Temporarily Impaired 12 Months or more, Fair Value 1,605 1,668
Temporarily Impaired, 12 Months or more, Unrealized Losses 76 141
Temporarily Impaired Total, Fair Value 1,605 2,664
Temporarily Impaired Total, Unrealized Losses $ 76 $ 146
Debt Securities Count 19 27
Residential mortgage-backed securities    
Temporarily Impaired Less than 12 Months, Fair Value $ 10 $ 3,500
Temporarily Impaired, Less than 12 Months, Unrealized Losses 0 361
Temporarily Impaired 12 Months or more, Fair Value 10,507 8,153
Temporarily Impaired, 12 Months or more, Unrealized Losses 2,088 1,967
Temporarily Impaired Total, Fair Value 10,517 11,653
Temporarily Impaired Total, Unrealized Losses $ 2,088 $ 2,328
Debt Securities Count 978 1,008
Commercial Mortgage Backed Securities    
Temporarily Impaired Less than 12 Months, Fair Value $ 0 $ 4,008
Temporarily Impaired, Less than 12 Months, Unrealized Losses 0 405
Temporarily Impaired 12 Months or more, Fair Value 4,745 685
Temporarily Impaired, 12 Months or more, Unrealized Losses 508 154
Temporarily Impaired Total, Fair Value 4,745 4,693
Temporarily Impaired Total, Unrealized Losses $ 508 $ 559
Debt Securities Count 253 254