Loan Receivables and Allowance for Credit Losses - Interest Income by Product (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Dec. 31, 2024 |
|||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||||||||
| Interest and fees on loans | [1] | $ 5,328 | $ 5,301 | $ 10,640 | $ 10,594 | ||||
| Contract with customer, liability | 1,700 | 1,700 | $ 1,800 | ||||||
| Credit cards | |||||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||||||||
| Interest and fees on loans | [2] | 5,076 | 5,013 | 10,131 | 10,109 | ||||
| Financing receivable, accrued interest, charge-off | 578 | 595 | 1,200 | 1,200 | |||||
| Consumer installment loans | |||||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||||||||
| Interest and fees on loans | 207 | 243 | 418 | 392 | |||||
| Commercial credit products | |||||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||||||||
| Interest and fees on loans | 43 | 43 | 88 | 88 | |||||
| Other | |||||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||||||||
| Interest and fees on loans | $ 2 | $ 2 | $ 3 | $ 5 | |||||
| |||||||||