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Automotive and GM Financial Debt Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2018 USD ($) credit_faciliy | Jun. 30, 2018 USD ($) | Jun. 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 |  |  |
Estimate of Fair Value Measurement [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt term |  |  | 18 months |
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 |  |  |
Automotive [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Dividends received |  | $ 2,000 |  |
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 |  |  | $ 161 |
GM Financial [Member] | Secured Debt [Member] | Notes Payable, Other Payables [Member] | Securitization notes payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | $ 10,300 | $ 10,300 |
Weighted average interest rate (percent) |  | 2.81% | 2.81% |
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | $ 7,000 | $ 7,000 |
Weighted average interest rate (percent) |  | 3.12% | 3.12% |
SGM [Member] | Automotive [Member] | Unsecured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  |  |  | $ 1,300

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