Unaudited Selected Quarterly Data (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Unaudited Selected Quarterly Data (Table Amounts) [Abstract]
Total sales	$ 6,397	$ 6,155	$ 6,000	$ 5,956	$ 5,694	$ 5,979	$ 5,896	$ 5,957	$ 24,508	$ 23,526	$ 23,979
Operating income	831	826	797	739	689	794	813	780	3,193	3,076	3,196
Net earnings	$ 525	$ 602	$ 517	$ 556	$ 459	$ 516	$ 531	$ 484	$ 2,200	$ 1,990	$ 2,069
Basic earnings per share	$ 2.98	$ 3.38	$ 2.87	$ 3.07	$ 2.52	$ 2.78	$ 2.77	$ 2.45	$ 12.30	$ 10.51	$ 9.91
Diluted earnings per share	$ 2.96	$ 3.35	$ 2.85	$ 3.03	$ 2.49	$ 2.75	$ 2.74	$ 2.41	$ 12.19	$ 10.39	$ 9.75
Weighted-average common shares outstanding	176.0	178.1	180.1	181.3	182.1	185.8	191.8	197.7	178.9	189.4	208.8
Weighted-average diluted shares outstanding	177.6	179.6	181.5	183.4	184.2	187.9	193.7	200.5	180.5	191.6	212.1