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Investment Securities (Summary Of Investment Securities In Unrealized Loss Positions) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Less than 12 Months, Fair Value |  | $ 8,504 | $ 8,008
Less than 12 Months, Unrealized Losses |  | 771 | 140
12 Months or more, Fair Value |  | 10,506 | 2,462
12 Months or more, Unrealized Losses |  | 2,262 | 81
Total, Fair Value |  | 19,010 | 10,470
Total, Unrealized Losses |  | 3,033 | 221
U.S. Treasury and other U.S. government agency securities |  |  |
Less than 12 Months, Fair Value |  | 996 | 465
Less than 12 Months, Unrealized Losses |  | 5 | 6
12 Months or more, Fair Value |  | 1,668 | 1,334
12 Months or more, Unrealized Losses |  | 141 | 33
Total, Fair Value |  | 2,664 | 1,799
Total, Unrealized Losses |  | 146 | 39
Residential mortgage-backed securities |  |  |
Less than 12 Months, Fair Value | [1] | 3,500 | 7,197
Less than 12 Months, Unrealized Losses | [1] | 361 | 128
12 Months or more, Fair Value | [1] | 8,153 | 1,128
12 Months or more, Unrealized Losses | [1] | 1,967 | 48
Total, Fair Value | [1] | 11,653 | 8,325
Total, Unrealized Losses | [1] | 2,328 | 176
Commercial Mortgage Backed Securities |  |  |
Less than 12 Months, Fair Value | [1] | 4,008 | 346
Less than 12 Months, Unrealized Losses | [1] | 405 | 6
12 Months or more, Fair Value | [1] | 685 | 0
12 Months or more, Unrealized Losses | [1] | 154 | 0
Total, Fair Value | [1] | 4,693 | 346
Total, Unrealized Losses | [1] | $ 559 | $ 6
[1] | Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

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