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Equity In Net Assets Of Nonconsolidated Affiliates (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Equity Income	$ 2,282	$ 2,194	$ 2,094
Equity Method Investments	8,996	9,201	8,350
Basis Difference	4,300	4,300
Automotive China JVs [Member]
Schedule of Equity Method Investments [Line Items]
Equity Income	1,973	2,057	2,066
Equity Method Investments	7,859	7,997
Other joint ventures [Member]
Schedule of Equity Method Investments [Line Items]
Equity Income	309	137	$ 28
Equity Method Investments	$ 1,137	$ 1,204
SGM [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	50.00%	50.00%
SGM [Member] | SAIC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	50.00%
SGM Norsom [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	25.00%	25.00%
SGM Norsom [Member] | SGM [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	50.00%
SGM Norsom [Member] | SAIC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	25.00%
SGM DY [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	25.00%	25.00%
SGM DY [Member] | SGM [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	50.00%
SGM DY [Member] | SAIC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	25.00%
SGM DYPT [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	25.00%	25.00%
SGM DYPT [Member] | SGM [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	50.00%
SGM DYPT [Member] | SAIC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	25.00%
SGMW [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	44.00%	44.00%
FAW-GM [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	50.00%	50.00%
PATAC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	50.00%	50.00%
Shanghai OnStar [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	40.00%	40.00%
Shanghai OnStar [Member] | SGM [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	20.00%
Shanghai Chengxin [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	33.00%	33.00%
Shanghai Chengxin [Member] | SGM [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	33.00%
SGMS [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	49.00%	49.00%
SAIC-GMAC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	35.00%	35.00%
SAIC-GMAC [Member] | SGM [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	20.00%
SAIC-GMAC [Member] | SAICFC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	45.00%

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