Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Basic
Net (loss) income	$ (9)	$ 52	$ 66	$ 73	$ 43	$ 139
Weighted average common shares outstanding – Basic	75,595,991		74,591,478		75,316,827	74,414,450
EPS – Basic	$ (0.12)		$ 0.88		$ 0.57	$ 1.87
Diluted
Net (loss) income	$ (9)	$ 52	$ 66	$ 73	$ 43	$ 139
Weighted average common shares outstanding – Basic	75,595,991		74,591,478		75,316,827	74,414,450
Dilutive effect of unvested RSUs and other contingently issuable shares	249,520		2,309,066		520,632	1,715,371
Weighted average common shares outstanding – Diluted	75,845,511		76,900,544		75,837,459	76,129,821
EPS – Diluted	$ (0.12)		$ 0.86		$ 0.57	$ 1.83