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Debt - Senior Notes (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 06, 2017
Debt Instrument [Line Items]
Increase (Decrease) of Restricted Investments	$ 157,000,000	$ (12,000,000)	$ 4,000,000	$ (6,000,000)
Available-for-sale securities	2,693,000,000	2,693,000,000	$ 1,758,000,000
Net carrying amount of debt	$ 2,041,000,000	$ 2,041,000,000
4.875% Notes
Debt Instrument [Line Items]
Percentage of contractual interest rate	4.875%	4.875%
5.375% Senior Notes due 2022
Debt Instrument [Line Items]
Percentage of contractual interest rate	5.375%	5.375%
Subtotal - current restricted investments
Debt Instrument [Line Items]
Available-for-sale securities	$ 169,000,000	$ 169,000,000
Senior Notes | 4.875% Notes
Debt Instrument [Line Items]
Principal amount					$ 330,000,000
Net carrying amount of debt	$ 330,000,000	$ 330,000,000
Percentage of contractual interest rate	4.875%	4.875%			4.875%
Senior Notes | 5.375% Senior Notes due 2022
Debt Instrument [Line Items]
Net carrying amount of debt	$ 700,000,000	$ 700,000,000
Percentage of contractual interest rate	5.375%	5.375%

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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