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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2013
Class of Stock [Line Items]
Increase in stockholders' equity	$ (78)
Net income	77	$ 24
Other comprehensive income	$ 1	6
Number of warrants issued (in shares)			13,490,236
Warrant, strike price per share (usd per share)			$ 53.8475
Stated percentage of warrants	1.125%
Unrecognized compensation expense	$ 39
Weighted average period for recognition (in years)	2 years 5 months
Unrecognized compensation forfeiture rate (as a percent)	3.80%
Restricted stock and performance awards
Class of Stock [Line Items]
Fair value of restricted and performance stock awards granted	$ 17	18
Total fair value of restricted shares vested	$ 16	$ 32
Common Stock
Class of Stock [Line Items]
Number of common stock issued (in shares)	246,000

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