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

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