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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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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).

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