Unaudited Selected Quarterly Data (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Unaudited Selected Quarterly Data (Table Amounts) [Abstract]
Sales	$ 6,157	$ 6,106	$ 6,294	$ 6,104	$ 6,476	$ 6,270	$ 6,274	$ 6,198	$ 24,661	$ 25,218	$ 26,412
Operating income	768	790	806	759	824	736	774	796	3,123	3,130	3,276
Net earnings	478	497	488	489	533	459	480	506	1,952	1,978	2,118
Basic earnings per share (in dollars per share)	$ 2.17	$ 2.18	$ 2.09	$ 2.07	$ 2.19	$ 1.86	$ 1.91	$ 2.00	$ 8.50	$ 7.96	$ 7.65
Diluted earnings per share (in dollars per share)	$ 2.12	$ 2.14	$ 2.05	$ 2.03	$ 2.14	$ 1.82	$ 1.88	$ 1.96	$ 8.35	$ 7.81	$ 7.52
Weighted-average common shares outstanding	220.5	228.2	234.0	236.4	243.4	247.2	250.8	253.1	229.6	248.6	276.8
Weighted-average diluted shares outstanding	225.2	232.6	237.5	241.0	248.9	252.1	254.7	258.0	233.9	253.4	281.6
Unaudited Selected Quarterly Data (Amounts in Paragraphs)
Number of common shares repurchased	6.6				7.3
Amount paid for common stock repurchased	$ 699				$ 487