Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income from continuing operations		$ 40	$ 42	$ 41	$ 95
Weighted-average common shares outstanding		131.9	136.0	133.4	135.9
Effect of dilutive securities:
Weighted-average common shares outstanding-assuming dilution		132.0	136.5	133.5	136.3
Basic earnings per share from continuing operations (in dollars per share)		$ 0.30	$ 0.31	$ 0.31	$ 0.70
Diluted earnings per share from continuing operations (in dollars per share)		$ 0.30	$ 0.30	$ 0.31	$ 0.70
Antidilutive securities excluded from computation of diluted earnings per share (in shares)		1.6		1.4	0.4
RSU [Member]
Effect of dilutive securities:
Dilutive securities	[1]	0.1	0.2	0.1	0.2
Antidilutive securities excluded from computation of diluted earnings per share (in shares)		0.1		0.1
Options [Member]
Effect of dilutive securities:
Dilutive securities	[2]		0.3		0.2

[1] RSUs to purchase 0.1 million shares for the three and six months ended June 30, 2020 were not included in the diluted earnings per share calculation because their effect would have been anti-dilutive.

[2] Options to purchase 1.6 million shares for the three months ended June 30, 2020, and 1.4 million and 0.4 million shares for the six months ended June 30, 2020, and 2019, respectively, were not included in the diluted earnings per share calculation because their effect would have been anti-dilutive.