Loans - Consumer, Excluding Credit Card Loan Portfolio, Residential Real Estate, Financial Effect of FDMs (Details) - Consumer, excluding credit card - Residential real estate - USD ($)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Modified [Line Items]
Trial modification trial payment period	3 months
Amortized cost basis of FDM's modified in the period	$ 1,000,000,000.0	$ 206,000,000	$ 136,000,000
Weighted-average term loan extensions	19 years	15 years	20 years
Weighted average contractual interest rate before modification	6.94%	7.53%	7.21%
Weighted average contractual interest rate after modification	6.08%	5.44%	4.44%
Commitments to lend to borrowers experiencing financial difficulty	$ 0	$ 0
Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
Amortized cost basis of FDM's modified in the period	$ 882,000,000

Financing Receivable, Modified, Trial Modification, Trial Payment Period

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Financing Receivable, Modified, Weighted-Average Interest Rate After Modification, During Period

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Financing Receivable, Modified, Weighted-Average Interest Rate Before Modification, During Period

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Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of commitment to lend additional funds to debtor experiencing financial difficulty for which creditor has modified terms of financing receivable.

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