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Investment Securities (Summary Of Investment Securities In Unrealized Loss Positions) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Less than 12 months, Fair Value |  | $ 16,067 | $ 8,008
Less than 12 Months, Unrealized Losses |  | 1,361 | 140
12 months or more, Fair Value |  | 4,201 | 2,462
12 Months or more, Unrealized Losses |  | 597 | 81
Total, Fair Value |  | 20,268 | 10,470
Total, Unrealized Losses |  | 1,958 | 221
U.S. Treasury and other U.S. government agency securities |  |  |
Less than 12 months, Fair Value |  | 1,098 | 465
Less than 12 Months, Unrealized Losses |  | 5 | 6
12 months or more, Fair Value |  | 1,704 | 1,334
12 Months or more, Unrealized Losses |  | 118 | 33
Total, Fair Value |  | 2,802 | 1,799
Total, Unrealized Losses |  | 123 | 39
Residential Mortgage Backed Securities |  |  |
Less than 12 months, Fair Value | [1] | 10,475 | 7,197
Less than 12 Months, Unrealized Losses | [1] | 1,124 | 128
12 months or more, Fair Value | [1] | 2,497 | 1,128
12 Months or more, Unrealized Losses | [1] | 479 | 48
Total, Fair Value | [1] | 12,972 | 8,325
Total, Unrealized Losses | [1] | 1,603 | 176
Commercial Mortgage Backed Securities |  |  |
Less than 12 months, Fair Value | [1] | 4,494 | 346
Less than 12 Months, Unrealized Losses | [1] | 232 | 6
12 months or more, Fair Value | [1] | 0 | 0
12 Months or more, Unrealized Losses | [1] | 0 | 0
Total, Fair Value | [1] | 4,494 | 346
Total, Unrealized Losses | [1] | $ 232 | $ 6
[1] | Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

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