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Automotive and GM Financial Debt Automotive and GM Financial Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Amount of debt reclassified	$ 1,500,000,000
Automotive [Member]
Debt Instrument [Line Items]
Total debt	13,502,000,000	$ 10,560,000,000
Fair value of debt	15,088,000,000	11,399,000,000
Available under credit facility agreements	$ 14,067,000,000	$ 14,181,000,000
Weighted-average interest rate on outstanding short-term debt	4.70%	10.70%
Weighted-average interest rate on outstanding long-term debt	5.20%	5.20%
Net discount and debt issuance costs	$ 499,000,000	$ 491,000,000
Automotive [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Total debt	204,000,000	108,000,000
Automotive [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total debt	12,579,000,000	9,742,000,000
Automotive [Member] | Level 1 [Member]
Debt Instrument [Line Items]
Fair value of debt	13,202,000,000	9,515,000,000
Automotive [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Fair value of debt	1,886,000,000	1,884,000,000
GM Financial [Member]
Debt Instrument [Line Items]
Total debt	80,717,000,000	64,563,000,000
Fair value of debt	81,937,000,000	65,207,000,000
GM Financial [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Total debt	39,887,000,000	35,087,000,000
Fair value of debt	39,948,000,000	35,162,000,000
GM Financial [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total debt	40,830,000,000	29,476,000,000
Fair value of debt	41,989,000,000	30,045,000,000
GM Financial [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Fair value of debt	79,623,000,000	62,951,000,000
GM Financial [Member] | Level 3 [Member]
Debt Instrument [Line Items]
Fair value of debt	2,314,000,000	2,256,000,000
Capital Lease Obligations [Member] | Automotive [Member]
Debt Instrument [Line Items]
Total debt	719,000,000	$ 710,000,000
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%	18.00%

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Debt Instrument, Reclassification of Debt from Long-term Debt to Short-term, Amount

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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