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Long-Term Debt - Components of Notes Payable (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Notes payable	$ 414	$ 425
Deferred loan costs	(1)	(2)
Less: current portion	(22)	(40)
Long-term debt, noncurrent	391	383
Notes Payable | Term Loan A
Line of Credit Facility [Line Items]
Notes payable	$ 0	303
Annual Contractual Interest Rate	3.95%
Effective Interest Rate	4.07%
Notes Payable | Term Loan A | LIBOR
Line of Credit Facility [Line Items]
Spread on variable rate	2.25%
Notes Payable | Term Loan A | Prime lending rate
Line of Credit Facility [Line Items]
Spread on variable rate	1.25%
Notes Payable | Term loan A-2
Line of Credit Facility [Line Items]
Notes payable	$ 0	122
Annual Contractual Interest Rate	3.83%
Effective Interest Rate	3.90%
Notes Payable | Term loan A-2 | LIBOR
Line of Credit Facility [Line Items]
Spread on variable rate	2.125%
Notes Payable | Term loan A-2 | Prime lending rate
Line of Credit Facility [Line Items]
Spread on variable rate	1.125%
Notes Payable | 2018 Term Loan A
Line of Credit Facility [Line Items]
Notes payable	$ 414	$ 0
Annual Contractual Interest Rate	4.15%
Effective Interest Rate	4.25%
Notes Payable | 2018 Term Loan A | LIBOR
Line of Credit Facility [Line Items]
Spread on variable rate	1.625%
Notes Payable | 2018 Term Loan A | Prime lending rate
Line of Credit Facility [Line Items]
Spread on variable rate	0.625%

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