Stock Compensation (Summary of Share-based Compensation) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Apr. 02, 2011
Stock Compensation [Abstract]
Outstanding, beginning of period - Shares	24	26
Granted - Shares	6	5
Stock options exercised and other in shares	(1)	(3)
Forfeitures and expirations - Shares	(1)	0
Outstanding, end of period - Shares	28	28
Exercisable, end of period - Shares	18	20
Outstanding, beginning of period - Weighted-average exercise price	$ 48	$ 47
Granted - Weighted-average exercise price	$ 53	$ 53
Exercised - Weighted-average exercise price	$ 42	$ 44
Forfeitures and expirations - Weighted-average exercise price	$ 53	$ 0
Outstanding, end of period - Weighted-average exercise price	$ 49	$ 48
Exercisable, end of period - Weighted-average exercise price	$ 47	$ 46
Outstanding, end of period - Weighted-average remaining contractual term (years)	6.9	6.8
Exercisable, end of period - Weighted-average remaining contractual term (years)	5.5	5.7
Outstanding, end of period - Aggregate intrinsic value	$ 123	$ 166
Exercisable, end of period - Aggregate intrinsic value	$ 115	$ 144
Weighted-average fair value of options granted	$ 5.23	$ 7.59