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Investment Securities (Summary Of Investment Securities) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Investment securities available-for-sale, Amortized Cost |  | $ 22,559 | $ 17,116
Investment securities available-for-sale, Gross Unrealized Gains |  | 0 | 91
Investment securities available-for-sale, Gross Unrealized Losses |  | 3,107 | 221
Investment securities available-for-sale, Fair Value |  | 19,452 | 16,986
U.S. Treasury and other U.S. government agency securities |  |  |
Investment securities available-for-sale, Amortized Cost |  | 2,918 | 3,010
Investment securities available-for-sale, Gross Unrealized Gains |  | 0 | 22
Investment securities available-for-sale, Gross Unrealized Losses |  | 162 | 39
Investment securities available-for-sale, Fair Value |  | 2,756 | 2,993
Residential Mortgage Backed Securities |  |  |
Investment securities available-for-sale, Amortized Cost | [1] | 14,390 | 13,397
Investment securities available-for-sale, Gross Unrealized Gains | [1] | 0 | 67
Investment securities available-for-sale, Gross Unrealized Losses | [1] | 2,338 | 176
Investment securities available-for-sale, Fair Value | [1] | 12,052 | 13,288
Commercial Mortgage Backed Securities |  |  |
Investment securities available-for-sale, Amortized Cost | [1] | 5,251 | 709
Investment securities available-for-sale, Gross Unrealized Gains | [1] | 0 | 2
Investment securities available-for-sale, Gross Unrealized Losses | [1] | 607 | 6
Investment securities available-for-sale, Fair Value | [1] | $ 4,644 | $ 705
[1] | Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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