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Debt - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Jul. 31, 2021 CAD ($) | Mar. 31, 2021 USD ($)
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 |  | $ 4,000,000,000.0 | $ 4,000,000,000.0 |  |
GM Financial | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate borrowing capacity |  | $ 18,700,000,000 | $ 18,700,000,000 |  |
GM Financial | Senior Notes | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  |  |  | $ 400 |
Stated interest rate |  |  |  | 1.70% |
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 | $ 2,000,000,000.0 | $ 2,000,000,000.0 | $ 2,000,000,000.0 |  |
GM Financial | Unsecured Debt | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  | $ 8,300,000,000 | $ 8,300,000,000 |  |
Weighted average interest rate (percent) |  | 1.65% | 1.65% |  |
GM Financial | Secured Debt | Notes Payable, Other Payables | Securitization notes payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  | $ 13,400,000,000 | $ 13,400,000,000 |  |
Weighted average interest rate (percent) |  | 0.75% | 0.75% |  |

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