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Income Taxes - U.S. Federal Statutory Income Tax Rate Reconciled to Effective Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Pre-Tax Income	$ 241	$ 200	$ 104
Tax Expense/(Benefit)
U.S. federal statutory tax rate	51	70	37
State income taxes, net of federal benefit	18	10	4
Tax rate change	0	(40)	(1)
Nondeductible meals, entertainment and penalties	1	1	4
Stock-based compensation	(9)	(15)	1
Uncertain tax positions	1	4	0
Tax credits	(4)	(3)	(1)
State and tax return to provision adjustment	(7)	(5)	(1)
Sec 199 benefits	0	(3)	0
Other	(2)	3	0
Total	$ 49	$ 22	$ 43
Percent of Pre-Tax Income (Loss)
U.S. federal statutory tax rate	21.00%	35.00%	35.00%
State income taxes, net of federal benefit	8.00%	5.00%	4.00%
Tax rate change	0.10%	(20.00%)	(1.00%)
Nondeductible meals, entertainment and penalties	1.00%	0.00%	4.00%
Stock-based compensation	(4.00%)	(7.00%)	1.00%
Uncertain tax positions	0.00%	2.00%	0.00%
Tax credits	(2.00%)	(1.00%)	(1.00%)
State and tax return to provision adjustment	(3.00%)	(3.00%)	(1.00%)
Sec 199 benefits	(0.00%)	(1.00%)	(0.00%)
Other	(1.00%)	1.00%	0.00%
Total	20.00%	11.00%	41.00%

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