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Investment Securities (Summary Of Investment Securities) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Investment securities available-for-sale, Amortized Cost |  | $ 17,116 | $ 14,752
Investment securities available-for-sale, Gross Unrealized Gains |  | 91 | 279
Investment securities available-for-sale, Gross Unrealized Losses |  | 221 | 3
Investment securities available-for-sale, Fair Value |  | 16,986 | 15,028
U.S. Treasury and other U.S. government agency securities |  |  |
Investment securities available-for-sale, Amortized Cost |  | 3,010 | 4,583
Investment securities available-for-sale, Gross Unrealized Gains |  | 22 | 76
Investment securities available-for-sale, Gross Unrealized Losses |  | 39 | 1
Investment securities available-for-sale, Fair Value |  | 2,993 | 4,658
Residential mortgage-backed securities |  |  |
Investment securities available-for-sale, Amortized Cost | [1] | 13,397 | 10,169
Investment securities available-for-sale, Gross Unrealized Gains | [1] | 67 | 203
Investment securities available-for-sale, Gross Unrealized Losses | [1] | 176 | 2
Investment securities available-for-sale, Fair Value | [1] | 13,288 | $ 10,370
Commercial Mortgage Backed Securities |  |  |
Investment securities available-for-sale, Amortized Cost | [1] | 709 |
Investment securities available-for-sale, Gross Unrealized Gains | [1] | 2 |
Investment securities available-for-sale, Gross Unrealized Losses | [1] | 6 |
Investment securities available-for-sale, Fair Value | [1] | $ 705 |
[1] | Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

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