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Automotive and GM Financial Debt Narrative (Details) - GM Financial [Member] $ in Millions | 6 Months Ended
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Jun. 30, 2017 USD ($)
Secured Debt [Member] | Securitization Notes Payable [Member] | Securitization notes payable [Member] |
Debt Instrument [Line Items] |
Principal amount | $ 9,300
Weighted average interest rate (percent) | 2.04%
Secured Debt [Member] | Revolving Credit Facility [Member] |
Debt Instrument [Line Items] |
Credit facilities entered, total net additional borrowing capacity | $ 1,900
Unsecured Debt [Member] | Senior Notes [Member] |
Debt Instrument [Line Items] |
Principal amount | $ 10,000
Weighted average interest rate (percent) | 2.90%

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