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Investments - Summary of Investments (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 2,518	$ 1,761
Gross Unrealized Gains	2	1
Gross Unrealized Losses	3	4
Estimated Fair Value	2,517	1,758
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	227
Gross Unrealized Gains	1
Gross Unrealized Losses	0
Estimated Fair Value	228
U.S. treasury notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	97
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	97
Subtotal - current restricted investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	324
Gross Unrealized Gains	1
Gross Unrealized Losses	0
Estimated Fair Value	325
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,387	1,180
Gross Unrealized Gains	1	1
Gross Unrealized Losses	2	2
Estimated Fair Value	1,386	1,179
U.S. treasury notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	263	84
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	263	84
GSEs
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	242	232
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1	1
Estimated Fair Value	241	231
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	140	143
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	1
Estimated Fair Value	140	142
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	128	69
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	128	69
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	34	53
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	34	$ 53
Subtotal - current investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,194
Gross Unrealized Gains	1
Gross Unrealized Losses	3
Estimated Fair Value	$ 2,192

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-Publisher FASB
-Name Accounting Standards Codification
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