Summary of Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ 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 Data [Abstract]
Net sales	$ 3,471	$ 3,006	$ 3,012	$ 2,955	$ 3,157	$ 2,833	$ 2,840	$ 2,495	$ 12,444	$ 11,325	$ 9,946
Gross profit	2,239	1,982	1,990	1,962	2,086	1,873	1,842	1,694	8,173	7,495	6,602
Earnings before income taxes	649	471	444	499	588	419	433	481	2,063	1,921	1,735
Net earnings	$ (249)	$ 434	$ 391	$ 444	$ 510	$ 355	$ 380	$ 402	$ 1,020	$ 1,647	$ 1,439
Basic net earnings per share of common stock (in dollars per share)	$ (0.66)	$ 1.16	$ 1.04	$ 1.19	$ 1.36	$ 0.95	$ 1.02	$ 1.08	$ 2.73	$ 4.40	$ 3.82
Diluted net earnings per share of common stock (in dollars per share)	(0.66)	1.14	1.03	1.17	1.34	0.94	1.00	1.07	$ 2.68	$ 4.35	$ 3.78
Market Price Of Common Stock, High (in dollars per share)	160.62	148.84	145.62	133.59	121.84	123.55	119.83	107.95
Market Price Of Common Stock, Low (in dollars per share)	141.68	137.70	129.82	116.50	106.48	109.75	106.26	86.68
Dividends declared per share of common stock	$ 0.470	$ 0.425	$ 0.425	$ 0.425	$ 0.425	$ 0.38	$ 0.380	$ 0.380