Loans - Consumer, Excluding Credit Card Loan Portfolio, Residential Real Estate, Financial Effect of FDMs (Details) - Consumer, excluding credit card - Residential real estate - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Financing Receivable, Modified [Line Items]
FDMs	$ 135,000,000	$ 74,000,000	$ 1,000,000,000.0	$ 188,000,000
Weighted-average term loan extensions	17 years	8 years	17 years	8 years
Weighted average contractual interest rate before modification	7.16%	7.78%	7.09%	7.81%
Weighted average contractual interest rate after modification	6.53%	5.78%	6.15%	5.37%
Commitments to lend to borrowers experiencing financial difficulty	$ 0		$ 0		$ 0
Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
FDMs	$ 77,000,000		$ 894,000,000

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

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

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- Definition

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.

+ References

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- Definition

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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