Securitizations and Variable Interest Entities - Schedule of Cash Flows with Nonconsolidated Special-Purpose Entities (Details) - Off-balance sheet variable interest entities - Consumer - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Consumer automotive | ||
| Cash Flow Received and Paid to Nonconsolidated Securitization Entities [Line Items] | ||
| Cash proceeds from transfers completed during the period | $ 480 | $ 191 |
| Servicing fees | 20 | 14 |
| Cash flows received on retained interests in securitization entities | 8 | 12 |
| Other cash flows received | 2 | 1 |
| Other | ||
| Cash Flow Received and Paid to Nonconsolidated Securitization Entities [Line Items] | ||
| Cash proceeds from transfers completed during the period | 0 | 8 |
| Servicing fees | $ 0 | $ 1 |