Summary of Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ 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 Data [Abstract]
Net sales	$ 3,796	$ 3,242	$ 3,322	$ 3,241	$ 3,471	$ 3,006	$ 3,012	$ 2,955	$ 13,601	$ 12,444	$ 11,325
Gross profit	2,456	2,155	2,190	2,137	2,241	1,984	1,991	1,964	8,938	8,180	7,504
Earnings before income taxes	657	534	623	542	649	471	444	499	2,356	2,063	1,921
Net earnings	$ 2,068	$ 590	$ 452	$ 443	$ (249)	$ 434	$ 391	$ 444	$ 3,553	$ 1,020	$ 1,647
Basic net earnings per share of common stock (in dollars per share)	$ 5.52	$ 1.58	$ 1.21	$ 1.18	$ (0.66)	$ 1.16	$ 1.04	$ 1.19	$ 9.50	$ 2.73	$ 4.40
Diluted net earnings per share of common stock (in dollars per share)	5.44	1.55	1.19	1.16	(0.66)	1.14	1.03	1.17	$ 9.34	$ 2.68	$ 4.35
Market Price Of Common Stock, High (in dollars per share)	178.90	177.76	179.84	170.00	160.62	148.84	145.62	133.59
Market Price Of Common Stock, Low (in dollars per share)	144.75	163.16	153.76	146.80	141.68	137.70	129.82	116.50
Dividends declared per share of common stock	$ 0.52	$ 0.47	$ 0.47	$ 0.47	$ 0.470	$ 0.425	$ 0.425	$ 0.425