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Debt - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Apr. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2021 | Oct. 27, 2021 | Mar. 31, 2021
Unsecured Debt | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate borrowing capacity |  | $ 11,200,000,000 |  |  |  |
Unsecured Debt | Line of Credit | Five Year Revolving Credit Facility Due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt term |  | 5 years | 5 years |  |  |
Aggregate borrowing capacity |  |  |  |  |  | $ 10,500,000,000
Unsecured Debt | Line of Credit | Five Year Revolving Credit Facility Due 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt term |  | 5 years |  |  |  |
Aggregate borrowing capacity |  | $ 9,900,000,000 |  |  |  |
Line of credit extension period |  | 3 years |  |  |  |
Unsecured Debt | Line of Credit | Three Year Revolving Credit Facility April 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt term |  | 3 years |  |  |  |
Aggregate borrowing capacity |  | $ 4,300,000,000 |  |  |  |
Unsecured Debt | Line of Credit | Three Year Revolving Credit Facility April 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt term |  |  |  | 3 years |  |
Aggregate borrowing capacity | $ 4,000,000,000 |  | $ 4,000,000,000 | $ 4,000,000,000 |  |
Unsecured Debt | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of debt | 450,000,000 |  |  |  |  |
GM Financial | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate borrowing capacity | 21,900,000,000 |  | 21,900,000,000 | 21,900,000,000 |  |
GM Financial | Senior Notes | Subsequent Event |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount |  |  |  |  | $ 2,300,000,000 |
Weighted average interest rate (percent) |  |  |  |  | 1.63% |
GM Financial | Senior Notes | 5.2% Senior Notes Due March 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount | $ 1,500,000,000 |  | $ 1,500,000,000 | $ 1,500,000,000 |  |
Stated interest rate | 5.20% |  | 5.20% | 5.20% |  |
Loss on extinguishment of debt | $ 105,000,000 |  |  |  |  |
GM Financial | Unsecured Debt | Line of Credit | $2.0 Billion Dollar Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt term |  | 364 days | 364 days | 364 days |  |
Aggregate borrowing capacity | 2,000,000,000 | $ 2,000,000,000 | $ 2,000,000,000 | $ 2,000,000,000 |  |
GM Financial | Unsecured Debt | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount | $ 9,900,000,000 |  | $ 9,900,000,000 | $ 9,900,000,000 |  |
Weighted average interest rate (percent) | 1.57% |  | 1.57% | 1.57% |  |
GM Financial | Secured Debt | Notes Payable, Other Payables | Securitization notes payable |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount | $ 19,300,000,000 |  | $ 19,300,000,000 | $ 19,300,000,000 |  |
Weighted average interest rate (percent) | 0.73% |  | 0.73% | 0.73% |  |

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