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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 29	$ 51	$ 58	$ 54	$ 66	$ 43	$ 40	$ 29	$ 192	$ 178	$ 61
Weighted average shares of common stock outstanding									70,385,639	69,175,377	70,159,696
Basic (in dollars per share)	$ 0.41	$ 0.73	$ 0.82	$ 0.77	$ 0.95	$ 0.62	$ 0.58	$ 0.42	$ 2.72	$ 2.57	$ 0.88
Dilutive effect of stock options and restricted stock units									2,000,000	2,000,000	2,000,000
Weighted average shares of common stock outstanding									72,300,663	71,385,280	71,972,486
Diluted (in dollars per share)	$ 0.40	$ 0.71	$ 0.80	$ 0.75	$ 0.92	$ 0.60	$ 0.56	$ 0.41	$ 2.65	$ 2.49	$ 0.85
Common stock equivalents excluded from income per diluted share because of their anti-dilutive effect									1,000,000	2,000,000	1,000,000

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