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Automotive and GM Financial Debt Automotive and GM Financial Debt (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Amount of debt reclassified | $ 1,500,000,000 |
Automotive [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 13,502,000,000 | $ 13,963,000,000
Fair value of debt | 15,088,000,000 | 13,531,000,000
Available under credit facility agreements | $ 14,067,000,000 | $ 14,167,000,000
Weighted-average interest rate on outstanding short-term debt | 4.70% | 6.60%
Weighted-average interest rate on outstanding long-term debt | 5.20% | 5.20%
Net discount and debt issuance costs | $ 499,000,000 | $ 499,000,000
Automotive [Member] | Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 204,000,000 | 143,000,000
Automotive [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 12,579,000,000 | 13,292,000,000
Automotive [Member] | Level 1 [Member] |  |
Debt Instrument [Line Items] |  |
Fair value of debt | 13,202,000,000 | 11,693,000,000
Automotive [Member] | Level 2 [Member] |  |
Debt Instrument [Line Items] |  |
Fair value of debt | 1,886,000,000 | 1,838,000,000
GM Financial [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 80,717,000,000 | 90,988,000,000
Fair value of debt | 81,937,000,000 | 90,391,000,000
GM Financial [Member] | Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 39,887,000,000 | 42,835,000,000
Fair value of debt | 39,948,000,000 | 42,835,000,000
GM Financial [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 40,830,000,000 | 48,153,000,000
Fair value of debt | 41,989,000,000 | 47,556,000,000
GM Financial [Member] | Level 2 [Member] |  |
Debt Instrument [Line Items] |  |
Fair value of debt | 79,623,000,000 | 88,305,000,000
GM Financial [Member] | Level 3 [Member] |  |
Debt Instrument [Line Items] |  |
Fair value of debt | 2,314,000,000 | 2,086,000,000
Capital Lease Obligations [Member] | Automotive [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | $ 719,000,000 | 528,000,000
Capital Lease Obligations [Member] | GM Financial [Member] |  |
Debt Instrument [Line Items] |  |
Total debt |  | $ 0
Minimum [Member] | Automotive [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate range on outstanding debt | 0.00% | 0.00%
Maximum [Member] | Automotive [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate range on outstanding debt | 21.80% | 18.50%

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