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Automotive and GM Financial Debt (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Automotive [Member] |  |
Debt Instrument [Line Items] |  |
Carrying Amount | $ 10,610 | $ 10,560
Fair Value | 11,626 | 11,399
Automotive [Member] | Level 1 [Member] |  |
Debt Instrument [Line Items] |  |
Fair Value | 9,679 | 9,515
Automotive [Member] | Level 2 [Member] |  |
Debt Instrument [Line Items] |  |
Fair Value | 1,947 | 1,884
GM Financial [Member] |  |
Debt Instrument [Line Items] |  |
Carrying Amount | 78,479 | 64,563
Fair Value | 79,571 | 65,207
GM Financial [Member] | Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Carrying Amount | 38,828 | 35,087
Fair Value | 38,926 | 35,162
GM Financial [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Carrying Amount | 39,651 | 29,476
Fair Value | 40,645 | 30,045
GM Financial [Member] | Level 2 [Member] |  |
Debt Instrument [Line Items] |  |
Fair Value | 77,695 | 62,951
GM Financial [Member] | Level 3 [Member] |  |
Debt Instrument [Line Items] |  |
Fair Value | $ 1,876 | $ 2,256

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