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Automotive and GM Financial Debt (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Automotive [Member] |  |
Debt Instrument [Line Items] |  |
Carrying Amount | $ 10,952 | $ 10,752
Fair Value | 11,913 | 11,612
Automotive [Member] | Level 1 [Member] |  |
Debt Instrument [Line Items] |  |
Fair Value | 9,590 | 9,515
Automotive [Member] | Level 2 [Member] |  |
Debt Instrument [Line Items] |  |
Fair Value | 2,323 | 2,097
GM Financial [Member] |  |
Debt Instrument [Line Items] |  |
Carrying Amount | 79,949 | 73,876
Fair Value | 81,070 | 74,577
GM Financial [Member] | Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Carrying Amount | 42,579 | 39,270
Fair Value | 42,680 | 39,357
GM Financial [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Carrying Amount | 37,370 | 34,606
Fair Value | 38,390 | 35,220
GM Financial [Member] | Level 2 [Member] |  |
Debt Instrument [Line Items] |  |
Fair Value | 77,267 | 69,990
GM Financial [Member] | Level 3 [Member] |  |
Debt Instrument [Line Items] |  |
Fair Value | $ 3,803 | $ 4,587

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