Unaudited Selected Quarterly Data (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Unaudited Selected Quarterly Data (Table Amounts) [Abstract]
Sales	$ 6,108	$ 5,984	$ 6,039	$ 5,848	$ 6,157	$ 6,106	$ 6,294	$ 6,104	$ 23,979	$ 24,661	$ 25,218
Operating income	762	769	820	845	768	790	806	759	3,196	3,123	3,130
Net earnings	506	473	511	579	478	497	488	489	2,069	1,952	1,978
Basic earnings per share (in dollars per share)	$ 2.52	$ 2.29	$ 2.41	$ 2.68	$ 2.17	$ 2.18	$ 2.09	$ 2.07	$ 9.91	$ 8.50	$ 7.96
Diluted earnings per share (in dollars per share)	$ 2.48	$ 2.26	$ 2.37	$ 2.63	$ 2.12	$ 2.14	$ 2.05	$ 2.03	$ 9.75	$ 8.35	$ 7.81
Weighted-average common shares outstanding	200.8	206.2	212.4	216.3	220.5	228.2	234.0	236.4	208.8	229.6	248.6
Weighted-average diluted shares outstanding	204.2	209.2	215.2	220.4	225.2	232.6	237.5	241.0	212.1	233.9	253.4
Unaudited Selected Quarterly Data (Amounts in Paragraphs)
Number of common shares repurchased	4.5				6.6
Amount paid for common stock repurchased	$ 599				$ 699