Revenue Recognition - Consolidated STatements of Operations (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net sales	$ 3,645	$ 3,817	$ 4,131	$ 3,781	$ 3,682	$ 3,776	$ 3,804	$ 3,486	$ 15,374	$ 14,748	$ 14,270
Cost of sales, exclusive of depreciation and amortization	$ 2,188	$ 2,253	$ 2,379	$ 2,181	$ 2,120	$ 2,104	$ 2,083	$ 1,902	9,001	8,209	7,665
Selling, general and administrative									3,573	3,554	3,555
Other income									(114)	(150)	(127)
Income before income taxes									1,693	2,005	779
Without adoption
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net sales									15,399
Cost of sales, exclusive of depreciation and amortization									8,925	8,207	7,693
Selling, general and administrative									3,682	3,564	3,588
Other income									122
Income before income taxes									1,693	$ 2,005	$ 779
Accounting Standards Update 2014-09 | Adjustments
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net sales									(25)
Cost of sales, exclusive of depreciation and amortization									76
Selling, general and administrative									(109)
Other income									8
Income before income taxes									$ 0