Equity (Earnings per Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Jan. 01, 2011	Oct. 02, 2010	Jul. 03, 2010	Apr. 03, 2010	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Equity [Abstract]
Net income, basic	$ 232	$ 290	$ 343	$ 366	$ 189	$ 338	$ 302	$ 418	$ 1,231	$ 1,247	$ 1,212
Average shares outstanding, basic									362	376	382
Net earnings per share, basic	$ 0.65	$ 0.81	$ 0.94	$ 1.00	$ 0.51	$ 0.91	$ 0.80	$ 1.10	$ 3.40	$ 3.32	$ 3.17
Average shares outstanding, dilutive potential common shares									2	2	2
Net earnings per share, dilutive potential common shares									$ (0.02)	$ (0.02)	$ (0.01)
Net income, diluted									$ 1,231	$ 1,247	$ 1,212
Average shares outstanding, diluted									364	378	384
Net earnings per share, diluted	$ 0.64	$ 0.80	$ 0.94	$ 1.00	$ 0.51	$ 0.90	$ 0.79	$ 1.09	$ 3.38	$ 3.30	$ 3.16