Reserves for Credit Losses - Narrative (Details)	Sep. 30, 2026
Financing Receivable, Past Due [Line Items]
CECL reasonable and supportable period	3 years
Card Balances
Financing Receivable, Past Due [Line Items]
Loans and receivables threshold period for write off	180 days
Other Loans
Financing Receivable, Past Due [Line Items]
Loans and receivables threshold period for write off	120 days