Loans - Consumer, Excluding Credit Card Loan Portfolio, Residential Real Estate, Loan Modifications, Narrative (Details) - Consumer, excluding credit card - Residential real estate - USD ($)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Modified [Line Items]
Amortized cost basis of FDM's modified in the period	$ 136,000,000
Weighted-average term loan extensions	20 years
Weighted average contractual interest rate	7.21%	4.44%
Additional commitments to lend to borrowers whose loans have been modified as FDM's	$ 0
Loans subject to a trial modification	69,000,000
Chapter 7 loans	9,000,000
New TDRs		$ 362,000,000	$ 866,000,000
30 or more days past due
Financing Receivable, Modified [Line Items]
Amortized cost basis of FDMs in the 12 months after modification	29,000,000
FDMs that re-defaulted	$ 17,000,000

Financing Receivable, Excluding Accrued Interest, Modified In Period, Chapter Seven, Amount

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- Definition

Financing Receivable, Modified, Additional Commitment to Lend

+ References

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- Definition

Financing Receivable, Modified, Weighted Average Interest Rate

+ References

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- Definition

Amortized cost excluding accrued interest, of financing receivable 12 months after modification for debtor experiencing financial difficulty.

+ References

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- Definition

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

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- Definition

Amortized cost excluding accrued interest, of financing receivable with payment default in current period and modified within previous 12 months preceding payment default 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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Amortized cost of financing receivable modified during period for debtor experiencing financial difficulty.

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- Definition

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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- Definition

Amount of financing receivable modified on trial basis.

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