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Equity In Net Assets of Nonconsolidated Affiliates (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Equity income	$ 648	$ 555
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Undistributed earnings	2,800		$ 2,200
Automotive China JVs equity income [Member]
Schedule of Equity Method Investments [Line Items]
Equity income	$ 597	504
Change in ownership percentage	0.00%
Equity Method Investment, Summarized Financial Information, Revenue	$ 13,719	11,201
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	1,177	1,046
Other joint ventures equity income [Member]
Schedule of Equity Method Investments [Line Items]
Equity income	$ 51	$ 51

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