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Loans - Summary of Loans Modified (Details) - USD ($)	3 Months Ended		6 Months Ended
Loans - Summary of Loans Modified (Details) - USD ($)	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Financing Receivable, Modified [Line Items]
Loans modified in period	$ 229,000,000	$ 245,000,000	$ 328,000,000	$ 491,000,000
Lending commitments related to modified loans	0	149,000,000	0	149,000,000
Loans that defaulted after modification	$ 0	$ 0	$ 0	$ 0
Corporate
Financing Receivable, Modified [Line Items]
Modified loans, percent of total			1.00%	1.00%
Credit Card Loans
Financing Receivable, Modified [Line Items]
Modified loans, percent of total				1.00%
Commercial real estate
Financing Receivable, Modified [Line Items]
Modified loans, percent of total			1.00%	1.00%
Residential real estate
Financing Receivable, Modified [Line Items]
Modified loans, percent of total			1.00%