Quarterly Financial Data (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Quarterly Financial Data
Net sales	$ 1,618	$ 1,622	$ 1,692	$ 1,535	$ 1,486	$ 1,567	$ 1,520	$ 1,360	$ 6,466	$ 5,932	$ 5,233
Gross profit	638	563	599	543	538	566	542	478	2,343	2,123	1,906
Net income	$ 310	$ 267	$ 291	$ 248	$ 259	$ 274	$ 263	$ 232	$ 1,116	$ 1,029	$ 948
Net income per share, diluted	$ 2.32	$ 1.94	$ 2.05	$ 1.71	$ 1.74	$ 1.81	$ 1.73	$ 1.50	$ 7.99	$ 6.78	$ 5.76
Basic	133.26	136.74	141.79	144.80	148.49	151.33	152.04	154.55	139.11	151.59	164.48
Diluted weighted average number of shares outstanding	133.56	137.02	141.96	144.94	148.76	151.54	152.22	154.72	139.35	151.79	164.62