Stock Compensation (Summary of Share-based Compensation) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011
Stock Compensation [Abstract]
Outstanding, beginning of period - Shares	24	26
Granted - Shares	6	5
Stock options exercised and other in shares	(1)	(6)
Forfeitures and expirations - Shares	(1)	0
Outstanding, end of period - Shares	28	25
Exercisable, end of period - Shares	18	16
Outstanding, beginning of period - Weighted-average exercise price	$ 48	$ 47
Granted - Weighted-average exercise price	$ 52	$ 53
Exercised - Weighted-average exercise price	$ 43	$ 45
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)	6.6	6.7
Exercisable, end of period - Weighted-average remaining contractual term (years)	5.3	5.5
Outstanding, end of period - Aggregate intrinsic value	$ 58	$ 177
Exercisable, end of period - Aggregate intrinsic value	$ 58	$ 146
Weighted-average fair value of options granted	$ 5.23	$ 7.59