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Debt - Secured Debt and Unsecured Debt (Details) $ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 31, 2020 USD ($) | May 31, 2020 USD ($) | Apr. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Jan. 31, 2021 USD ($) | Jan. 31, 2021 CAD ($) | Dec. 31, 2019
Automotive |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Weighted-average interest rate on outstanding long-term debt |  |  |  |  | 5.60% |  |  | 5.40%
Revolving Credit Facility | GM Financial | Unsecured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Weighted-average interest rate |  |  |  |  | 2.47% |  |  |
Maximum | Revolving Credit Facility | GM Financial | Unsecured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt term |  |  |  |  | 4 years |  |  |
Line of Credit | Unsecured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds borrowed |  |  |  | $ 2,000 |  |  |  |
Debt term |  | 3 years | 3 years |  |  |  |  |
Aggregate borrowing capacity |  | $ 2,000 | $ 3,000 |  |  |  |  |
Dividend restriction covenant, amount outstanding |  |  |  |  | $ 5,000 |  |  |
Line of Credit | Unsecured Debt | Three Year Revolving Credit Facility April 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds borrowed |  |  |  | 3,400 |  |  |  |
Debt term |  |  | 3 years |  | 3 years |  |  |
Aggregate borrowing capacity |  |  | $ 4,000 |  | $ 4,000 |  |  |
Line of Credit | Unsecured Debt | Five Year Revolving Credit Facility Due 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds borrowed |  |  |  | $ 10,500 |  |  |  |
Debt term |  |  |  |  | 5 years |  |  |
Aggregate borrowing capacity |  |  |  |  | $ 10,500 |  |  |
Line of Credit | Unsecured Debt | Three Year Revolving Credit Facility April 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate borrowing capacity |  |  | $ 3,600 |  |  |  |  |
Line of Credit | GM Financial | Unsecured Debt | Two Billion Dollar Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt term |  | 364 days | 364 days |  | 364 days |  |  |
Aggregate borrowing capacity |  | $ 2,000 | $ 2,000 |  | $ 2,000 |  |  |
Line of Credit | Revolving Credit Facility | GM Financial | Secured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Increase to maximum borrowing capacity |  |  |  |  | 21,100 |  |  |
Senior Notes | Unsecured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount of debt issued |  | $ 4,000 |  |  |  |  |  |
Weighted-average interest rate |  | 6.11% |  |  |  |  |  |
Senior Notes | Unsecured Debt | Floating Rate Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt | $ 500 |  |  |  |  |  |  |
Senior Notes | GM Financial | Senior Notes Due 2031 | Subsequent Event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount of debt issued |  |  |  |  |  | $ 2,500 |  |
Weighted-average interest rate |  |  |  |  |  | 1.69% | 1.69% |
Senior Notes | GM Financial | CAD Senior Notes Due 2026 | Subsequent Event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount of debt issued |  |  |  |  |  |  | $ 500 |
Weighted-average interest rate |  |  |  |  |  | 1.75% | 1.75% |
Senior Notes | GM Financial | Unsecured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount of debt issued |  |  |  |  | $ 9,200 |  |  |
Weighted-average interest rate |  |  |  |  | 2.93% |  |  |
Weighted-average interest rate on outstanding long-term debt |  |  |  |  | 3.25% |  |  |
Notes Payable, Other Payables | GM Financial | Secured Debt | Securitization notes payable |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount of debt issued |  |  |  |  | $ 24,600 |  |  |
Weighted-average interest rate |  |  |  |  | 1.17% |  |  |
Weighted-average interest rate on outstanding long-term debt |  |  |  |  | 1.89% |  |  |

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