Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 3,064	$ 2,170	$ 2,831
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments	0	694	(264)
Pension and OPEB adjustments	3	(11)	(13)
Net unrealized gains on cash flow hedges	2	17
Reclassification into earnings from cash flow hedges	8	13	9
Unrealized gains (losses) on available-for-sale securities	13	2	(6)
Other comprehensive income (loss), net of tax	26	715	(274)
Comprehensive Income	3,090	2,885	2,557
Less: Comprehensive Income Attributable to Noncontrolling Interests	5	20	4
Comprehensive Income Attributable to Parent	$ 3,085	$ 2,865	$ 2,553