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Variable Interest Entities Affordable Housing Tax Credit Investments (Details) - Tax Credit Investments - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Variable Interest Entity [Line Items]
Tax credit investments included in other assets	$ 1,473		$ 1,473		$ 1,471
Unfunded tax credit commitments included in other liabilities	485		485		590
Loans and letters of credit commitments	545		545		663
Funded portion of loans and letters of credit commitments	311		311		$ 336
Tax credits and other tax benefits recognized	57	$ 59	169	$ 175
Tax credit amortization expense included in provision for income taxes	$ 47	$ 49	$ 142	$ 142

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