Loan Receivables and Allowance for Credit Losses - Interest Income by Product (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||||
| Interest and fees on loans | [1] | $ 5,591 | $ 5,510 | $ 16,384 | $ 16,150 | |||
| Contract with customer, liability | 1,800 | 1,800 | ||||||
| Credit cards | ||||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||||
| Interest and fees on loans | [2] | 5,305 | 5,255 | 15,549 | 15,386 | |||
| Financing receivable, accrued interest, charge-off | 561 | 541 | 1,800 | 1,800 | ||||
| Consumer installment loans | ||||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||||
| Interest and fees on loans | 178 | 208 | 553 | 626 | ||||
| Commercial credit products | ||||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||||
| Interest and fees on loans | 107 | 46 | 279 | 134 | ||||
| Other | ||||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||||
| Interest and fees on loans | $ 1 | $ 1 | $ 3 | $ 4 | ||||
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