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Net (Loss) Income per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator:
Net (loss) income	$ (262)	$ (97)	$ (230)	$ 77	$ (47)	$ 42	$ 33	$ 24	$ (512)	$ 52	$ 143
Shares outstanding at the beginning of the period (in shares)					56					56	55	49
Weighted-average number of shares issued:
Common stock offering (in shares)									0	0	3
Denominator for basic net (loss) income per share (in shares)									56	55	52
Effect of dilutive securities:
Share-based compensation (in shares)									0	0	1
Convertible senior notes (in shares)									0	0	1
1.125% Warrants (in shares)									0	1	2
Denominator for diluted net (loss) income per share (in shares)									56	56	56
Net (loss) income per share:
Basic (in dollars per share)	$ (4.59)	$ (1.70)	$ (4.10)	$ 1.38	$ (0.85)	$ 0.77	$ 0.58	$ 0.44	$ (9.07)	$ 0.93	$ 2.75
Diluted (in dollars per share)	$ (4.59)	$ (1.70)	$ (4.10)	$ 1.37	$ (0.85)	$ 0.76	$ 0.58	$ 0.43	$ (9.07)	$ 0.92	$ 2.58
1.125% Warrants
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Potentially dilutive common shares excluded from calculations									2	0	0
1.625% Notes
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Potentially dilutive common shares excluded from calculations									1	0	0
Cash Convertible Senior Notes Due 2020, Warrants [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Stated interest rate	1.125%								1.125%

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