Share-Based Compensation (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014
Compensation expense included in net income
Compensation expense	$ 31	$ 34
Income tax benefit	(11)	(12)
Total net compensation expense included in net income	20	22
Stock Options
Share-Based Compensation
Maximum term of options	10 years
Vesting period	3 years
Weighted-average assumptions used in Black-Scholes option-pricing model
Fair value of options at grant date	$ 14.03	$ 12.72
Dividend yield (as a percent)	0.20%	0.20%
Expected volatility (as a percent)	34.90%	34.50%
Risk-free interest rate (as a percent)	1.50%	1.50%
Expected term (in years)	4 years 9 months 18 days	5 years
Number of Options
Outstanding at beginning of period (in shares)	8,637
Granted	1,492
Exercised	(452)
Forfeited or expired	(137)
Outstanding at end of period (in shares)	9,540
Exercisable at end of period (in shares)	6,213
Weighted-Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 29.99
Granted	$ 44.31
Exercised	$ (27.20)
Forfeited or expired	$ (45.95)
Outstanding at end of period (in dollars per share)	$ 32.13
Exercisable at end of period (in dollars per share)	$ 28.16
Additional information
Aggregate intrinsic value of outstanding options	123
Weighted-average remaining contractual life of outstanding stock options	7 years
Aggregate intrinsic value of exercisable options	105
Weighted-average remaining contractual life of exercisable options	6 years
Aggregate intrinsic value of options exercised	$ 8	$ 8