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Investments - Summary of Investments (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 2,115	$ 1,761
Gross Unrealized Gains	1	1
Gross Unrealized Losses	3	4
Estimated Fair Value	2,113	1,758
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	229
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	229
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	326
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	326
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,162	1,180
Gross Unrealized Gains	1	1
Gross Unrealized Losses	1	2
Estimated Fair Value	1,162	1,179
GSEs
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	221	232
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1	1
Estimated Fair Value	220	231
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	132	143
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1	1
Estimated Fair Value	131	142
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	125	69
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	125	69
U.S. treasury notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	121	84
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	121	84
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	28	53
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	28	$ 53
Subtotal - current investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,789
Gross Unrealized Gains	1
Gross Unrealized Losses	3
Estimated Fair Value	$ 1,787

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-Publisher FASB
-Name Accounting Standards Codification
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