Derivative Financial Instruments - Balance Sheet Location of GM Financial Unsecured Debt (Details) - Fair Value Hedges - GM Financial - USD ($) $ in Millions |
Jun. 30, 2024 |
Dec. 31, 2023 |
|---|---|---|
| Derivatives, Fair Value [Line Items] | ||
| Carrying Amount of Hedged Items | $ 36,614 | $ 33,551 |
| Cumulative Amount of Fair Value Hedging Adjustments | 1,220 | 1,029 |
| Cumulative fair value adjustment on discontinued hedging relationships | 852 | 872 |
| Short-term unsecured debt | ||
| Derivatives, Fair Value [Line Items] | ||
| Carrying Amount of Hedged Items | 6,381 | 3,508 |
| Cumulative Amount of Fair Value Hedging Adjustments | (31) | (8) |
| Long-term unsecured debt | ||
| Derivatives, Fair Value [Line Items] | ||
| Carrying Amount of Hedged Items | 30,233 | 30,043 |
| Cumulative Amount of Fair Value Hedging Adjustments | $ 1,252 | $ 1,037 |