Unaudited Selected Quarterly Data (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended			21 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012
Unaudited Selected Quarterly Data (Table Amounts) [Abstract]
Sales	$ 6,476	$ 6,270	$ 6,274	$ 6,198	$ 6,506	$ 6,612	$ 6,560	$ 6,734	$ 25,218	$ 26,412	$ 28,143
Operating income	824	736	774	796	799	825	841	811	3,130	3,276	2,827
Net earnings	533	459	480	506	548	520	520	530	1,978	2,118	2,053
Basic earnings per share (in dollars per share)	$ 2.19	$ 1.86	$ 1.91	$ 2.00	$ 2.12	$ 1.89	$ 1.84	$ 1.82	$ 7.96	$ 7.65	$ 6.91
Diluted earnings per share (in dollars per share)	$ 2.14	$ 1.82	$ 1.88	$ 1.96	$ 2.09	$ 1.86	$ 1.81	$ 1.79	$ 7.81	$ 7.52	$ 6.82
Weighted-average common shares outstanding	243.4	247.2	250.8	253.1	258.2	274.9	282.6	291.8	248.6	276.8	296.9
Weighted-average diluted shares outstanding	248.9	252.1	254.7	258.0	262.7	279.3	287.2	296.9	253.4	281.6	301.1
Unaudited Selected Quarterly Data (Amounts in Paragraphs)
Net earnings from discontinued operations					(2)			34	0	32	134
Earnings per share, discontinued operations (in dollars per share)					$ (0.01)			$ 0.12	$ 0.00	$ 0.11	$ 0.50
Contribution to the company's pension plans					500
Number of common stock shares repurchased	7.3				11.8
Amount paid for common stock repurchased	$ 487				$ 649							$ 3,900