Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Millions, $ 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
Quarterly Financial Information Disclosure [Abstract]
Total net sales	$ 72,383	$ 56,576	$ 52,886	$ 51,042	$ 60,453	$ 43,744	$ 37,955	$ 35,714	$ 232,887	$ 177,866	$ 135,987
Operating income	3,786	3,724	2,983	1,927	2,127	347	628	1,005	12,421	4,106	4,186
Income before income taxes	3,350	3,390	2,605	1,916	1,872	316	666	953	11,261	3,806	3,892
Provision for income taxes	(327)	(508)	(74)	(287)	(16)	(58)	(467)	(229)	(1,197)	(769)	(1,425)
Net income	$ 3,027	$ 2,883	$ 2,534	$ 1,629	$ 1,856	$ 256	$ 197	$ 724	$ 10,073	$ 3,033	$ 2,371
Basic earnings per share	$ 6.18	$ 5.91	$ 5.21	$ 3.36	$ 3.85	$ 0.53	$ 0.41	$ 1.52	$ 20.68	$ 6.32	$ 5.01
Diluted earnings per share	$ 6.04	$ 5.75	$ 5.07	$ 3.27	$ 3.75	$ 0.52	$ 0.40	$ 1.48	$ 20.14	$ 6.15	$ 4.90
Shares used in computation of earnings per share:
Basic (in shares)	490	488	486	484	483	481	479	477	487	480	474
Diluted (in shares)	501	501	500	498	496	494	492	490	500	493	484