Derivative Financial Instruments - Balance Sheet Location of GM Financial Unsecured Debt (Details) - Fair Value Hedges - GM Financial - USD ($) $ in Millions |
Mar. 31, 2022 |
Dec. 31, 2021 |
|---|---|---|
| Derivatives, Fair Value [Line Items] | ||
| Carrying Amount of Hedged Items | $ 26,157 | $ 24,964 |
| Cumulative Amount of Fair Value Hedging Adjustments on Hedging Relationships | 153 | (226) |
| Short-term unsecured debt | ||
| Derivatives, Fair Value [Line Items] | ||
| Carrying Amount of Hedged Items | 1,503 | 1,338 |
| Cumulative Amount of Fair Value Hedging Adjustments on Hedging Relationships | 8 | (1) |
| Long-term unsecured debt | ||
| Derivatives, Fair Value [Line Items] | ||
| Carrying Amount of Hedged Items | 24,654 | 23,626 |
| Cumulative Amount of Fair Value Hedging Adjustments on Hedging Relationships | 146 | (225) |
| Cumulative fair value adjustment on discontinued hedging relationships | $ 196 | $ 246 |