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Other (Income) Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Income and Expenses [Abstract]
Interest income	$ (92)	$ (90)	$ (257)	$ (284)
Interest expense	190	189	569	564
Exchange losses (gains)	42	(6)	119	5
Equity income from affiliates	(81)	(18)	(93)	(11)
Net periodic defined benefit plan (credit) cost other than service cost	(119)	(121)	(384)	(381)
Other, net	(112)	(161)	(466)	(244)
Other (income) expense, net	$ (172)	$ (207)	$ (512)	$ (351)

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