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Automotive and GM Financial Debt Narrative (Details) $ in Billions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 26, 2018 USD ($) credit_faciliy | Mar. 31, 2018 USD ($)
Subsequent Event [Member] |  |
Debt Instrument [Line Items] |  |
Number of renewed credit facilities | credit_faciliy | 2 |
Estimate of Fair Value Measurement [Member] |  |
Debt Instrument [Line Items] |  |
Debt term |  | 18 months
Line of Credit [Member] | Subsequent Event [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate borrowing capacity | $ 16.5 |
Line of Credit [Member] | Three Year Revolving Credit Facility April 2018 [Member] | Subsequent Event [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate borrowing capacity | $ 4.0 |
Debt term | 3 years |
Line of Credit [Member] | Letter of Credit [Member] | Subsequent Event [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate borrowing capacity | $ 1.1 |
Line of Credit [Member] | Five-Year Revolving Credit Facility April 2018 [Member] | Subsequent Event [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate borrowing capacity | $ 10.5 |
Debt term | 5 years |
Automotive [Member] | Subsequent Event [Member] |  |
Debt Instrument [Line Items] |  |
Number of new credit facilities | credit_faciliy | 1 |
Automotive [Member] | Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate borrowing capacity |  | $ 14.5
GM Financial [Member] | Line of Credit [Member] | $2.0 Billion Revolving Credit Facility [Member] | Subsequent Event [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate borrowing capacity | $ 2.0 |
Debt term | 364 days |
GM Financial [Member] | Secured Debt [Member] | Notes Payable, Other Payables [Member] | Securitization notes payable [Member] |  |
Debt Instrument [Line Items] |  |
Principal amount |  | $ 4.7
Weighted average interest rate (percent) |  | 2.59%
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Principal amount |  | $ 3.4
Weighted average interest rate (percent) |  | 2.30%
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes [Member] | Subsequent Event [Member] |  |
Debt Instrument [Line Items] |  |
Principal amount | $ 2.5 |
Weighted average interest rate (percent) | 3.80% |
SGM [Member] | Automotive [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Principal amount |  | $ 1.3

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