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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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Loans - Summary of Loans Modified (Details) - USD ($)	3 Months Ended		9 Months Ended
Loans - Summary of Loans Modified (Details) - USD ($)	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Modified [Line Items]
Loans modified in period	$ 366,000,000	$ 500,000,000	$ 788,000,000	$ 1,115,000,000
Lending commitments related to modified loans	$ 168,000,000	$ 132,000,000	168,000,000	132,000,000
Loans that defaulted after modification			$ 0	$ 0
Corporate
Financing Receivable, Modified [Line Items]
Modified loans, percent of total			2.00%	2.00%
Credit Card Loans
Financing Receivable, Modified [Line Items]
Modified loans, percent of total			1.00%	1.00%
Commercial real estate
Financing Receivable, Modified [Line Items]
Modified loans, percent of total			1.00%	1.00%