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Investment Securities (Summary Of Investment Securities In Unrealized Loss Positions) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Less than 12 Months, Fair Value |  | $ 8,008 | $ 2,071
Less than 12 Months, Unrealized Losses |  | 140 | 3
12 Months or more, Fair Value |  | 2,462 | 0
12 Months or more, Unrealized Losses |  | 81 | 0
Total, Fair Value |  | 10,470 | 2,071
Total, Unrealized Losses |  | 221 | 3
U.S. Treasury and other U.S. government agency securities |  |  |
Less than 12 Months, Fair Value |  | 465 | 1,119
Less than 12 Months, Unrealized Losses |  | 6 | 1
12 Months or more, Fair Value |  | 1,334 | 0
12 Months or more, Unrealized Losses |  | 33 | 0
Total, Fair Value |  | 1,799 | 1,119
Total, Unrealized Losses |  | 39 | 1
Residential mortgage-backed securities |  |  |
Less than 12 Months, Fair Value | [1] | 7,197 | 952
Less than 12 Months, Unrealized Losses | [1] | 128 | 2
12 Months or more, Fair Value | [1] | 1,128 | 0
12 Months or more, Unrealized Losses | [1] | 48 | 0
Total, Fair Value | [1] | 8,325 | 952
Total, Unrealized Losses | [1] | 176 | $ 2
Commercial Mortgage Backed Securities |  |  |
Less than 12 Months, Fair Value | [1] | 346 |
Less than 12 Months, Unrealized Losses | [1] | 6 |
12 Months or more, Fair Value | [1] | 0 |
12 Months or more, Unrealized Losses | [1] | 0 |
Total, Fair Value | [1] | 346 |
Total, Unrealized Losses | [1] | $ 6 |
[1] | Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

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