Condensed Consolidated Statements of Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Noncontrolling Interests [Member]
Beginning Balance at Dec. 31, 2013	$ 6,056	$ 1	$ 5,652	$ (5,288)	$ 5,726	$ (110)	$ 75
Beginning Balance, Shares at Dec. 31, 2013		85.8
Class of Stock [Line Items]
Net income	313				307		6
Other comprehensive income	14					14
Distributions to noncontrolling interests	(6)						(6)
Cash dividends declared on common stock	(106)				(106)
Shares issued:
Employee savings plans	74		74
Employee savings plans, Shares		0.7
Exercise of stock options	101		101
Exercise of stock options, Shares		1.1
Employee stock purchase plan	18		18
Employee stock purchase plan, Shares		0.2
Vesting of restricted stock units	0	$ 0	0	0	$ 0	$ 0	$ 0
Vesting of restricted stock units, Shares		0.6
Employee restricted stock units surrendered in lieu of income tax withholding	(26)		(26)
Employee restricted stock units surrendered in lieu of income tax withholding, Shares		(0.2)
Stock-based compensation expense	29		29
Treasury stock purchased	(333)			$ (333)
Treasury stock purchased, Shares				(2.9)
Retirement of Convertible Contingent Debt Securities	(160)		(160)
Other	$ 5		$ 5
Other, Shares	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Ending Balance at Jun. 27, 2014	$ 5,979	$ 1	$ 5,693	$ (5,621)	$ 5,927	$ (96)	$ 75
Ending Balance, Shares at Jun. 27, 2014		85.3
Beginning Balance at Dec. 31, 2014	5,360	$ 1	5,798	(6,111)	6,181	(584)	75
Beginning Balance, Shares at Dec. 31, 2014		82.0
Class of Stock [Line Items]
Net income	233				225		8
Other comprehensive income	6					6
Distributions to noncontrolling interests	(8)						(8)
Cash dividends declared on common stock	(109)				(109)
Shares issued:
Employee savings plans	62		62
Employee savings plans, Shares		0.5
Exercise of stock options	62		62
Exercise of stock options, Shares		0.5
Employee stock purchase plan	17		17
Employee stock purchase plan, Shares		0.2
Vesting of restricted stock units	0	$ 0	0	0	$ 0	$ 0	$ 0
Vesting of restricted stock units, Shares		0.7
Employee restricted stock units surrendered in lieu of income tax withholding	(33)		(33)
Employee restricted stock units surrendered in lieu of income tax withholding, Shares		(0.2)
Stock-based compensation expense	24		24
Treasury stock purchased	(346)			$ (346)
Treasury stock purchased, Shares				(2.9)
Other	$ 4		$ 4
Other, Shares	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Ending Balance at Jun. 26, 2015	$ 5,272	$ 1	$ 5,934	$ (6,457)	$ 6,297	$ (578)	$ 75
Ending Balance, Shares at Jun. 26, 2015		80.8