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Share-Based Compensation - Compensation expense and stock options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Compensation expense included in net income
Compensation expense	$ 7	$ 31
Income tax benefit	(3)	(11)
Total net compensation expense included in net income	$ 4	$ 20
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	$ 10.33	$ 14.03
Dividend yield (as a percent)	0.20%	0.20%
Expected volatility (as a percent)	33.60%	34.90%
Risk-free interest rate (as a percent)	1.20%	1.50%
Expected term (in years)	4 years 9 months 18 days	4 years 9 months 18 days
Number of Options
Outstanding at beginning of period (in shares)	8,808
Granted	1,792
Exercised	(114)
Forfeited or expired	(48)
Outstanding at end of period (in shares)	10,438
Exercisable at end of period (in shares)	6,780
Weighted-Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 32.91
Granted	34.50
Exercised	(25.97)
Forfeited or expired	(41.94)
Outstanding at end of period (in dollars per share)	33.21
Exercisable at end of period (in dollars per share)	$ 30.24
Additional information
Aggregate intrinsic value of outstanding options	$ 57
Weighted-average remaining contractual life of outstanding stock options	7 years
Aggregate intrinsic value of exercisable options	$ 53
Weighted-average remaining contractual life of exercisable options	6 years
Aggregate intrinsic value of options exercised	$ 1	$ 8

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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