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Investment Securities (Summary Of Investment Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Amortized Cost	$ 17,918	$ 19,541
Gross Unrealized Gains	1	0
Gross Unrealized Losses	2,874	2,672
Fair Value	15,045	16,869
U.S. Treasury securities
Amortized Cost	1,277	1,681
Gross Unrealized Gains	1	0
Gross Unrealized Losses	1	76
Fair Value	1,277	1,605
Residential mortgage-backed securities
Amortized Cost	11,380	12,607
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2,304	2,088
Fair Value	9,076	10,519
Commercial Mortgage Backed Securities
Amortized Cost	5,261	5,253
Gross Unrealized Gains	0	0
Gross Unrealized Losses	569	508
Fair Value	$ 4,692	$ 4,745

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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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