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Automotive and GM Financial Debt Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2018 USD ($) | Apr. 30, 2018 USD ($) credit_faciliy | Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Number of renewed credit facilities | credit_faciliy |  | 2 |  |  |
Number of new credit facilities | credit_faciliy |  | 1 |  |  |
Line of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate borrowing capacity |  | $ 16,500 |  |  | $ 14,500
Line of Credit [Member] | Three Year Revolving Credit Facility April 2018 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate borrowing capacity |  | $ 4,000 |  |  |
Debt term |  | 3 years |  |  |
Line of Credit [Member] | Letter of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate borrowing capacity |  | $ 1,100 |  |  |
Line of Credit [Member] | Five-Year Revolving Credit Facility April 2018 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate borrowing capacity |  | $ 10,500 |  |  |
Debt term |  | 5 years |  |  |
Unsecured Debt [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  |  | $ 2,100 | $ 2,100 |
Weighted average interest rate (percent) |  |  | 5.03% | 5.03% |
GM Financial [Member] | Line of Credit [Member] | $2.0 Billion Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate borrowing capacity |  | $ 2,000 |  |  |
Debt term |  | 364 days |  |  |
GM Financial [Member] | Secured Debt [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total net additional borrowing capacity |  |  |  | $ 345 |
GM Financial [Member] | Secured Debt [Member] | Notes Payable, Other Payables [Member] | Securitization notes payable [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  |  | $ 16,300 | $ 16,300 |
Weighted average interest rate (percent) |  |  | 2.89% | 2.89% |
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  |  | $ 7,200 | $ 7,200 |
Weighted average interest rate (percent) |  |  | 3.17% | 3.17% |
U.S. [Member] | GM Financial [Member] | Unsecured Debt [Member] | Commercial Paper [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unsecured commercial paper |  |  | $ 1,500 | $ 1,500 |
Non-U.S. [Member] | U.K. and Canada [Member] | Pension Plan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Contributions to pension plans |  |  | $ 584 |  |
Subsequent Event [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt repayment | $ 1,500 |  |  |  |

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