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Investments - Summary of Investments (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Jun. 06, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,824	$ 2,700
Gross Unrealized Gains	1	1
Gross Unrealized Losses	13	8
Estimated Fair Value	1,812	2,693
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		101
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value		101
U.S. treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		68
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value		68
Subtotal - current restricted investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		169
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value		169
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,197	1,591
Gross Unrealized Gains	1	1
Gross Unrealized Losses	7	4
Estimated Fair Value	1,191	1,588
U.S. treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	222	389
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1	1
Estimated Fair Value	221	388
GSEs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	172	255
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2	2
Estimated Fair Value	170	253
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	121	142
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2	1
Estimated Fair Value	119	141
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	93	117
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1	0
Estimated Fair Value	92	117
Certificate of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15	37
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	15	37
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	$ 4
Subtotal - current investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		2,531
Gross Unrealized Gains		1
Gross Unrealized Losses		8
Estimated Fair Value		$ 2,524
Senior Notes | 4.875% Notes
Debt Securities, Available-for-sale [Line Items]
Percentage of contractual interest rate	4.875%		4.875%
Senior Notes | 1.625% Notes
Debt Securities, Available-for-sale [Line Items]
Percentage of contractual interest rate	1.625%

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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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