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Automotive and GM Financial Debt (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Automotive [Member] |  |
Debt Instrument [Line Items] |  |
Carrying amount | $ 10,752 | $ 8,765
Fair Value | 12,148 | 9,088
Automotive [Member] | Level 1 [Member] |  |
Debt Instrument [Line Items] |  |
Fair Value | 9,985 | 6,972
Automotive [Member] | Level 2 [Member] |  |
Debt Instrument [Line Items] |  |
Fair Value | 2,163 | 2,116
GM Financial [Member] |  |
Debt Instrument [Line Items] |  |
Carrying amount | 68,348 | 54,346
Fair Value | 69,392 | 54,397
GM Financial [Member] | Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Carrying amount | 35,237 | 30,689
Fair Value | 35,418 | 30,671
GM Financial [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Carrying amount | 33,111 | 23,657
Fair Value | 33,974 | 23,726
GM Financial [Member] | Level 2 [Member] |  |
Debt Instrument [Line Items] |  |
Fair Value | 64,432 | 48,716
GM Financial [Member] | Level 3 [Member] |  |
Debt Instrument [Line Items] |  |
Fair Value | $ 4,960 | $ 5,681

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