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Equity In Net Assets of Nonconsolidated Affiliates (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Equity income	$ 637	$ 530	$ 1,285	$ 1,085
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Dividends received	2,000	1,600	2,000	1,600
Undistributed earnings	1,500		1,500		$ 2,200
Automotive China JVs equity income [Member]
Schedule of Equity Method Investments [Line Items]
Equity income	592	509	$ 1,189	1,013
Change in ownership percentage			0.00%
Equity Method Investment, Summarized Financial Information, Revenue	12,601	10,815	$ 26,320	22,016
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	1,194	902	2,371	1,948
Other joint ventures equity income [Member]
Schedule of Equity Method Investments [Line Items]
Equity income	$ 45	$ 21	$ 96	$ 72

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The change in percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

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Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities.

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