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Investments - Summary of Investments (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 06, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,270	$ 2,700
Gross Unrealized Gains	0	1
Gross Unrealized Losses	14	8
Estimated Fair Value	2,256	2,693
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	55	101
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	55	101
U.S. treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	25	68
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	25	68
Subtotal - current restricted investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	80	169
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	80	169
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,390	1,591
Gross Unrealized Gains	0	1
Gross Unrealized Losses	8	4
Estimated Fair Value	1,382	1,588
U.S. treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	331	389
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1	1
Estimated Fair Value	330	388
GSEs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	209	255
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2	2
Estimated Fair Value	207	253
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	138	142
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2	1
Estimated Fair Value	136	141
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	100	117
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1	0
Estimated Fair Value	99	117
Certificate of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	19	37
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	19	37
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	3
Subtotal - current investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,190	2,531
Gross Unrealized Gains	0	1
Gross Unrealized Losses	14	8
Estimated Fair Value	$ 2,176	$ 2,524
Senior Notes | 4.875% Notes
Debt Securities, Available-for-sale [Line Items]
Percentage of contractual interest rate	4.875%		4.875%

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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