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Earnings Per Share - Narrative (Details) - USD ($) shares in Millions			12 Months Ended
	Mar. 04, 2016	Mar. 03, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of anti-dilutive shares excluded from the calculation of diluted earnings per share (in shares)			0.8	3.6
Dividends paid to stockholders			$ 0	$ 0	$ 0
Parent
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dividend paid to parent		$ 1,362,000,000
Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares of common stock issued (in shares)	137.0