Derivative Financial Instruments - Balance Sheet Location of GM Financial Unsecured Debt (Details) - Fair Value Hedges - GM Financial - USD ($) $ in Millions |
Sep. 30, 2023 |
Dec. 31, 2022 |
|---|---|---|
| Derivatives, Fair Value [Line Items] | ||
| Carrying Amount of Hedged Items | $ 29,545 | $ 28,319 |
| Cumulative Amount of Fair Value Hedging Adjustments | 1,224 | 781 |
| Cumulative fair value adjustment on discontinued hedging relationships | 615 | |
| Short-term unsecured debt | ||
| Derivatives, Fair Value [Line Items] | ||
| Carrying Amount of Hedged Items | 2,758 | 3,048 |
| Cumulative Amount of Fair Value Hedging Adjustments | (8) | 2 |
| Long-term unsecured debt | ||
| Derivatives, Fair Value [Line Items] | ||
| Carrying Amount of Hedged Items | 26,788 | 25,271 |
| Cumulative Amount of Fair Value Hedging Adjustments | $ 1,232 | $ 779 |