UNAUDITED 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 [Member]	Noncontrolling Interests [Member]
Beginning Balance at Dec. 31, 2016	$ 4,624	$ 1	$ 6,284	$ (7,224)	$ 6,218	$ (726)	$ 71
Beginning Balance (in shares) at Dec. 31, 2016		77.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	375				366		9
Other comprehensive income (loss)	90					90
Distributions to noncontrolling interests	(9)						(9)
Cash dividends declared	(118)				(118)
Shares issued:
Employee savings plans	60		60
Employee savings plans (in shares)		0.4
Exercise of stock options	25		25
Exercise of stock options (in shares)		0.3
Employee stock purchase plan	16		16
Employee stock purchase plan (in shares)		0.1
Vesting of restricted stock and performance units	0
Vesting of restricted stock and performance units (in shares)		0.3
Repurchases of common stock to satisfy tax withholding obligations	(18)		(18)
Repurchases of common stock to satisfy tax withholding obligations (in shares)		(0.1)
Stock-based compensation expense	28		28
Treasury stock purchased	(26)			(26)
Treasury stock purchased (in shares)		(0.2)
Ending Balance at Jun. 30, 2017	5,047	$ 1	6,395	(7,250)	6,466	(636)	71
Ending Balance (in shares) at Jun. 30, 2017		78.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment of ASC 606 on January 1, 2018, net of taxes	13				13
Beginning Balance at Dec. 31, 2017	5,151	$ 1	6,518	(7,404)	6,659	(691)	68
Beginning Balance (in shares) at Dec. 31, 2017		77.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	587				578		9
Other comprehensive income (loss)	(23)					(23)
Distributions to noncontrolling interests	(9)						(9)
Cash dividends declared	(126)				(126)
Shares issued:
Employee savings plans	72		72
Employee savings plans (in shares)		0.3
Exercise of stock options	103		103
Exercise of stock options (in shares)		1.2
Employee stock purchase plan	17		17
Employee stock purchase plan (in shares)		0.1
Vesting of restricted stock and performance units	0
Vesting of restricted stock and performance units (in shares)		0.3
Repurchases of common stock to satisfy tax withholding obligations	(24)		(24)
Repurchases of common stock to satisfy tax withholding obligations (in shares)		(0.1)
Stock-based compensation expense	34		34
Treasury stock purchased	(287)			(287)
Treasury stock purchased (in shares)		(1.5)
Other	4		2		2
Ending Balance at Jun. 29, 2018	$ 5,512	$ 1	$ 6,722	$ (7,691)	$ 7,126	$ (714)	$ 68
Ending Balance (in shares) at Jun. 29, 2018		78.2