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Equity In Net Assets of Nonconsolidated Affiliates (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Equity income	$ 530	$ 500	$ 1,815	$ 1,585
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Dividends received		382	2,000	2,000
Undistributed earnings	2,000		2,000		$ 2,200
Automotive China JVs equity income [Member]
Schedule of Equity Method Investments [Line Items]
Equity income	485	459	$ 1,674	1,472
Change in ownership percentage			0.00%
Equity Method Investment, Summarized Financial Information, Revenue	11,461	12,161	$ 37,781	34,177
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	999	964	3,370	2,912
Other joint ventures equity income [Member]
Schedule of Equity Method Investments [Line Items]
Equity income	$ 45	$ 41	$ 141	$ 113

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