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Derivative Financial Instruments - Notional Amounts for Derivative Financial Instruments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Automotive [Member] | Not Designated as Hedges [Member]
Derivative [Line Items]
Notional	$ 4,732		$ 4,732		$ 5,926
Automotive [Member] | Not Designated as Hedges [Member] | PSA Group [Member] | Interest Income and Other Non-Operating Income, Net [Member]
Derivative [Line Items]
Gains (losses) on derivative instruments	114	$ 32	(303)	$ 171
Automotive [Member] | Not Designated as Hedges [Member] | Fair Value Level 2 [Member] | PSA Group [Member] | Other assets [Member]
Derivative [Line Items]
Fair value of derivative instruments	659		659		964
Automotive [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional	4,236		4,236		5,075
Automotive [Member] | Not Designated as Hedges [Member] | Commodity [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional	451		451		806
Automotive [Member] | Not Designated as Hedges [Member] | PSA Warrants [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional	45		45		45
GM Financial [Member]
Derivative [Line Items]
Notional	131,201		131,201		108,673
Fair Value of Assets	1,706		1,706		636
Fair Value of Liabilities	1,209		1,209		519
Collateral	778		778		210
Collateral available for netting	274		274
GM Financial [Member] | Designated as Hedges [Member] | Fair Value Hedges [Member] | Interest Rate Swap [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional	10,894		10,894		9,458
Fair Value of Assets	609		609		234
Fair Value of Liabilities	0		0		23
GM Financial [Member] | Designated as Hedges [Member] | Fair Value Hedges [Member] | Foreign Currency Swaps [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional	1,797		1,797		1,796
Fair Value of Assets	26		26		22
Fair Value of Liabilities	68		68		71
GM Financial [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] | Interest Rate Swap [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional	964		964		590
Fair Value of Assets	0		0		0
Fair Value of Liabilities	32		32		6
GM Financial [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] | Foreign Currency Swaps [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional	5,143		5,143		4,429
Fair Value of Assets	26		26		40
Fair Value of Liabilities	302		302		119
GM Financial [Member] | Not Designated as Hedges [Member] | Interest Rate Contract [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional	112,403		112,403		92,400
Fair Value of Assets	1,045		1,045		340
Fair Value of Liabilities	$ 807		$ 807		$ 300

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