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Investment Securities (Summary Of Investment Securities) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Investment securities available-for-sale, Amortized Cost |  | $ 22,045 | $ 17,116
Investment securities available-for-sale, Gross Unrealized Gains |  | 0 | 91
Investment securities available-for-sale, Gross Unrealized Losses |  | 3,033 | 221
Investment securities available-for-sale, Fair Value |  | 19,012 | 16,986
U.S. Treasury and other U.S. government agency securities |  |  |
Investment securities available-for-sale, Amortized Cost |  | 2,810 | 3,010
Investment securities available-for-sale, Gross Unrealized Gains |  | 0 | 22
Investment securities available-for-sale, Gross Unrealized Losses |  | 146 | 39
Investment securities available-for-sale, Fair Value |  | 2,664 | 2,993
Residential mortgage-backed securities |  |  |
Investment securities available-for-sale, Amortized Cost | [1] | 13,983 | 13,397
Investment securities available-for-sale, Gross Unrealized Gains | [1] | 0 | 67
Investment securities available-for-sale, Gross Unrealized Losses | [1] | 2,328 | 176
Investment securities available-for-sale, Fair Value | [1] | 11,655 | 13,288
Commercial Mortgage Backed Securities |  |  |
Investment securities available-for-sale, Amortized Cost | [1] | 5,252 | 709
Investment securities available-for-sale, Gross Unrealized Gains | [1] | 0 | 2
Investment securities available-for-sale, Gross Unrealized Losses | [1] | 559 | 6
Investment securities available-for-sale, Fair Value | [1] | $ 4,693 | $ 705
[1] | Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

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