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Automotive and GM Financial Debt (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Automotive [Member] |  |
Debt Instrument [Line Items] |  |
Carrying Amount | $ 15,963 | $ 13,502
Fair Value | 16,352 | 15,088
Automotive [Member] | Level 1 [Member] |  |
Debt Instrument [Line Items] |  |
Fair Value | 13,971 | 13,202
Automotive [Member] | Level 2 [Member] |  |
Debt Instrument [Line Items] |  |
Fair Value | 2,381 | 1,886
GM Financial [Member] |  |
Debt Instrument [Line Items] |  |
Carrying Amount | 86,377 | 80,717
Fair Value | 86,741 | 81,937
GM Financial [Member] | Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Carrying Amount | 39,722 | 39,887
Fair Value | 39,679 | 39,948
GM Financial [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Carrying Amount | 46,655 | 40,830
Fair Value | 47,062 | 41,989
GM Financial [Member] | Level 2 [Member] |  |
Debt Instrument [Line Items] |  |
Fair Value | 84,693 | 79,623
GM Financial [Member] | Level 3 [Member] |  |
Debt Instrument [Line Items] |  |
Fair Value | $ 2,048 | $ 2,314

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