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Automotive and GM Financial Debt Secured Debt and Unsecured Debt (Details) € in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2019 USD ($) | Oct. 31, 2018 USD ($) | Apr. 30, 2018 USD ($) credit_faciliy | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jul. 31, 2020 USD ($) | Jan. 31, 2019 EUR (€) | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of renewed credit facilities | credit_faciliy |  |  | 2 |  |  |  |  |  |  |
Number of new credit facilities | credit_faciliy |  |  | 1 |  |  |  |  |  |  |
Debt repayment |  | $ 1,500 |  |  |  |  |  |  |  |
Automotive [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate on outstanding long-term debt |  |  |  | 5.20% | 5.20% |  |  |  |  |
Revolving Credit Facility [Member] | GM Financial [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate |  |  |  | 5.98% |  |  |  |  |  |
Maximum [Member] | Revolving Credit Facility [Member] | GM Financial [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt term |  |  |  | 4 years |  |  |  |  |  |
Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate borrowing capacity |  |  | $ 16,500 |  |  |  |  |  |  | $ 14,500
Line of Credit [Member] | Subsequent Event [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate borrowing capacity | $ 3,000 |  |  |  |  |  |  |  |  |
Line of Credit [Member] | Three-Year Revolving Credit Facility January 2019 [Member] | Subsequent Event [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt term | 3 years |  |  |  |  |  |  |  |  |
Line of Credit [Member] | Revolving Credit Facility [Member] | GM Financial [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Increase to maximum borrowing capacity |  |  |  | $ 695 |  |  |  |  |  |
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 |  |  |  |  |  |  |
Senior Notes [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of debt issued |  |  |  |  |  |  |  |  | $ 2,100 |
Weighted-average interest rate |  |  |  |  |  |  |  |  | 5.03% |
Senior Notes [Member] | GM Financial [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of debt issued |  |  |  | $ 8,600 |  |  |  |  |  |
Weighted-average interest rate |  |  |  | 3.36% |  |  |  |  |  |
Weighted-average interest rate on outstanding long-term debt |  |  |  | 3.40% |  |  |  |  |  |
Senior Notes [Member] | GM Financial [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of debt issued | $ 2,500 |  |  |  |  |  |  |  |  |
Weighted-average interest rate | 5.03% |  |  |  |  |  |  | 5.03% |  |
Notes Payable, Other Payables [Member] | GM Financial [Member] | Secured Debt [Member] | Securitization notes payable [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of debt issued |  |  |  | $ 22,800 |  |  |  |  |  |
Weighted-average interest rate |  |  |  | 3.00% |  |  |  |  |  |
Weighted-average interest rate on outstanding long-term debt |  |  |  | 2.85% |  |  |  |  |  |
Medium-term Notes [Member] | GM Financial [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of debt issued | € |  |  |  |  |  |  |  | € 850 |  |
Weighted-average interest rate | 2.20% |  |  |  |  |  |  | 2.20% |  |
U.S. [Member] | Commercial Paper [Member] | GM Financial [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Unsecured commercial paper |  |  |  | $ 1,200 |  |  |  |  |  |
Line of Credit [Member] | $2.0 Billion Revolving Credit Facility [Member] | GM Financial [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate borrowing capacity |  |  | $ 2,000 |  |  |  |  |  |  |
Debt term |  |  | 364 days |  |  |  |  |  |  |
Pension Plan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Employer contributions |  |  |  | 1,700 | $ 1,230 | $ 3,076 |  |  |  |
Pension Plan [Member] | Non-U.S. [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Employer contributions |  |  |  | 1,624 | $ 1,153 | $ 1,022 |  |  |  |
Pension Plan [Member] | Non-U.S. [Member] | United Kingdom and Canada [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Employer contributions |  |  |  | $ 584 |  |  |  |  |  |
Forecast [Member] | Line of Credit [Member] | Three-Year Revolving Credit Facility January 2019 [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate borrowing capacity |  |  |  |  |  |  | $ 2,000 |  |  |

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