Loans - Consumer, Excluding Credit Card Loan Portfolio (Details) - USD ($) $ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
Jun. 30, 2024 |
|---|---|---|---|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Total retained loans | $ 1,345,473 | $ 1,299,590 | $ 1,273,047 |
| Consumer, excluding credit card | |||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Total retained loans | 371,855 | 376,334 | $ 382,795 |
| Consumer, excluding credit card | Residential real estate | |||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Total retained loans | 305,061 | 309,513 | |
| Consumer, excluding credit card | Auto and other | |||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Total retained loans | $ 66,794 | $ 66,821 |