Interim Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Non-controlling Interests [Member]
Total stockholders' equity, beginning balance at Dec. 31, 2015	$ 130	$ 2	$ 775	$ (115)	$ (536)	$ 4
Shares, beginning balance at Dec. 31, 2015		181,069,751
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	237			237
Common stock issued - compensation plans (in shares)		650,971
Dividends	(16)		(11)	(5)
Other comprehensive income	13				13
Stock-based compensation expense	17		17
Total stockholders' equity, ending balance at Sep. 30, 2016	381	$ 2	781	117	(523)	4
Shares, ending balance at Sep. 30, 2016		181,720,722
Total stockholders' equity, beginning balance at Dec. 31, 2016	104	$ 2	789	(114)	(577)	4
Shares, beginning balance at Dec. 31, 2016		182,600,533
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	519			518		1
Common stock issued - compensation plans (in shares)		504,098
Dividends	(16)			(16)
Other comprehensive income	157				157
Stock-based compensation expense	21		21
Cancellation of unissued stock awards withheld to cover taxes	(10)		(10)
Exercise of stock options, net	30		30
Exercise of stock options, net (in shares)		1,987,427
Total stockholders' equity, ending balance at Sep. 30, 2017	$ 805	$ 2	$ 830	$ 388	$ (420)	$ 5
Shares, ending balance at Sep. 30, 2017		185,092,058