Product Warranty and Related Liabilities (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended										3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Recalls - Ignition Switch [Member]	Sep. 30, 2014 Recalls - Steering [Member]	Sep. 30, 2014 Recalls - Side Impact Restraints Non-Deployment [Member]	Sep. 30, 2014 Recalls - Brake Lamp Wiring Harness [Member]	Sep. 30, 2014 Recalls - Safety Belt Cable Fatigue [Member]	Sep. 30, 2014 Recalls - Shift Cable Wear Out [Member]	Sep. 30, 2014 Recalls - Ignition Keys [Member]	Sep. 30, 2014 Recalls - Other matters [Member]	Sep. 30, 2014 GMNA [Member]	Sep. 30, 2014 GMNA [Member]	Jun. 30, 2014 Automotive Cost of Sales [Member] GMNA [Member] Recall Campaigns Warranty Obligations [Member]	Sep. 30, 2014 Automotive Cost of Sales [Member] GMNA [Member] Recall Campaigns Warranty Obligations [Member]
Movement in Product Warranty Accrual [Roll Forward]
Balance at Beginning of Period	$ 7,601	$ 7,633
Warranties issued and assumed in period - recall campaigns and courtesy transportation	2,658	481
Warranties issued and assumed in period - policy and warranty	1,904	2,090
Payments	(3,103)	(2,437)
Adjustments to pre-existing warranties	1,095	5
Effect of foreign currency and other	(132)	(191)
Balance at End of Period	10,023	7,581
Statement [Line Items]
Percentage of Recall Cost Recorded												90.00%
Recall charges	2,700		680	340	185	90	80	150	325	520
Number of vehicles recalled	34,000,000		2,600,000	1,900,000	1,300,000	2,700,000	1,500,000	1,400,000	12,100,000	5,200,000	3,500,000
Recall Cost Adjustment - Courtesy Transportation			(95)
Recall Cost Adjustment - Repair Efficiency			(80)
Catch-up adjustment, change in estimate for recall campaigns													$ 874	$ 874