Equity In Net Assets of Nonconsolidated Affiliates (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Equity income	$ 414	$ 648
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Dividends declared but not paid	1,600
Undistributed earnings	2,700		$ 2,300
Automotive China JVs equity income [Member]
Schedule of Equity Method Investments [Line Items]
Equity income	$ 376	597
Change in ownership percentage	0.00%
Net sales	$ 10,146	13,719
Net income	767	1,177
Other joint ventures equity income [Member]
Schedule of Equity Method Investments [Line Items]
Equity income	$ 38	$ 51