Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 125,555	$ 96,145	$ 88,912	$ 75,452	$ 87,437	$ 69,981	$ 63,404	$ 59,700	$ 386,064	$ 280,522	$ 232,887
Operating income	6,873	6,194	5,843	3,989	3,879	3,157	3,084	4,420	22,899	14,541	12,421
Income before income taxes	7,765	6,809	6,221	3,383	4,053	2,632	2,889	4,401	24,178	13,976	11,261
Provision for income taxes	(566)	(569)	(984)	(744)	(786)	(494)	(257)	(836)	(2,863)	(2,374)	(1,197)
Net income	$ 7,222	$ 6,331	$ 5,243	$ 2,535	$ 3,268	$ 2,134	$ 2,625	$ 3,561	$ 21,331	$ 11,588	$ 10,073
Basic earnings per share (in dollars per share)	$ 14.38	$ 12.63	$ 10.50	$ 5.09	$ 6.58	$ 4.31	$ 5.32	$ 7.24	$ 42.64	$ 23.46	$ 20.68
Diluted earnings per share (in dollars per share)	$ 14.09	$ 12.37	$ 10.30	$ 5.01	$ 6.47	$ 4.23	$ 5.22	$ 7.09	$ 41.83	$ 23.01	$ 20.14
Shares used in computation of earnings per share:
Basic (in shares)	502	501	500	498	496	495	493	491	500	494	487
Diluted (in shares)	513	512	509	506	505	504	503	502	510	504	500