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Investment Securities (Summary Of Investment Securities) (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
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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