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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

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