Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 60,453	$ 43,744	$ 37,955	$ 35,714	$ 43,741	$ 32,714	$ 30,404	$ 29,128	$ 177,866	$ 135,987	$ 107,006
Operating income	2,127	347	628	1,005	1,255	575	1,285	1,071	4,106	4,186	2,233
Income before income taxes	1,872	316	666	953	1,166	491	1,179	1,056	3,806	3,892	1,568
Provision for income taxes	(16)	(58)	(467)	(229)	(414)	(229)	(307)	(475)	(769)	(1,425)	(950)
Net income	$ 1,856	$ 256	$ 197	$ 724	$ 749	$ 252	$ 857	$ 513	$ 3,033	$ 2,371	$ 596
Basic earnings per share (in usd per share)	$ 3.85	$ 0.53	$ 0.41	$ 1.52	$ 1.57	$ 0.53	$ 1.81	$ 1.09	$ 6.32	$ 5.01	$ 1.28
Diluted earnings per share (in usd per share)	$ 3.75	$ 0.52	$ 0.40	$ 1.48	$ 1.54	$ 0.52	$ 1.78	$ 1.07	$ 6.15	$ 4.90	$ 1.25
Shares used in computation of earnings per share:
Basic (in shares)	483	481	479	477	476	474	473	471	480	474	467
Diluted (in shares)	496	494	492	490	486	485	483	481	493	484	477