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Investment Securities (Summary Of Investment Securities) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  | $ 21,019 | $ 22,045
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | 2,724 | 3,033
Fair Value |  | 18,295 | 19,012
U.S. Treasury securities |  |  |
Amortized Cost |  | 2,103 | 2,810
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | 119 | 146
Fair Value |  | 1,984 | 2,664
Residential mortgage-backed securities |  |  |
Amortized Cost | [1] | 13,665 | 13,983
Gross Unrealized Gains | [1] | 0 | 0
Gross Unrealized Losses | [1] | 2,134 | 2,328
Fair Value | [1] | 11,531 | 11,655
Commercial mortgage-backed securities |  |  |
Amortized Cost | [1] | 5,251 | 5,252
Gross Unrealized Gains | [1] | 0 | 0
Gross Unrealized Losses | [1] | 471 | 559
Fair Value | [1] | $ 4,780 | $ 4,693
[1] | Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

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