CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (UNAUDITED) - 9 months ended Sep. 30, 2017 - USD ($) shares in Millions, $ in Millions		Total	Common Stock		Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive (Loss) Income	[2]
Balance (shares) at Dec. 31, 2016			84	[1]			(28)
Balance at Dec. 31, 2016		$ 1,648	$ 1		$ 2,288	$ 1,654	$ (2,077)	$ (218)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		449				449
Foreign currency translation adjustments		75						75
Stock compensation expense, net (in shares)	[1]		1
Stock compensation expense, net					64
Exercise of common stock options					1
Shares repurchased and retired					(26)
Other					(5)
Balance (shares) at Sep. 30, 2017			85	[1]			(28)
Balance at Sep. 30, 2017		$ 2,211	$ 1		$ 2,322	$ 2,108	$ (2,077)	$ (143)

[1] Common stock outstanding decreased by approximately 8 million net shares during the year ended December 31, 2016.

[2] The Accumulated Other Comprehensive Loss balance primarily reflects foreign currency translation adjustments.