Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income (Loss) from Continuing Operations		$ 129	$ (163)	$ 341
Weighted-average common shares outstanding		135.8	135.5	134.4
Effect of dilutive securities:
Weighted-average common shares outstanding-assuming dilution		136.2	135.5	135.4
Basic earnings (loss) per share from continuing operations (in dollars per share)		$ 0.95	$ (1.20)	$ 2.54
Diluted earnings (loss) per share from continuing operations (in dollars per share)		$ 0.95	(1.20)	$ 2.52
Weighted Average Potentially Dilutive Shares Excluded From EPS Calculation, Exercise Price			$ 29.34
RSUs [Member]
Effect of dilutive securities:
Dilutive securities		0.1		0.1
Weighted Average Potentially Dilutive Shares Excluded From EPS Calculation			0.2
Stock Options [Member]
Effect of dilutive securities:
Dilutive securities	[1]	0.3		0.9
Antidilutive securities excluded from computation of diluted earnings per share (in shares)		0.5		0.9
Weighted Average Potentially Dilutive Shares Excluded From EPS Calculation			0.4

[1] Options to purchase 0.5 million and 0.9 million shares for the years ended December 31, 2019 and 2017, respectively, were not included in the diluted earnings per share calculation because their effect would have been antidilutive.