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Investments - Summary of Investments (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 2,536	$ 2,700
Gross Unrealized Gains	0	1
Gross Unrealized Losses	15	8
Estimated Fair Value	2,521	2,693
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	66	101
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	66	101
U.S. treasury notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11	68
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	11	68
Subtotal - current restricted investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	77	169
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	77	169
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,627	1,591
Gross Unrealized Gains	0	1
Gross Unrealized Losses	9	4
Estimated Fair Value	1,618	1,588
U.S. treasury notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	330	389
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1	1
Estimated Fair Value	329	388
GSEs
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	229	255
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2	2
Estimated Fair Value	227	253
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	133	142
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2	1
Estimated Fair Value	131	141
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	111	117
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1	0
Estimated Fair Value	110	117
Certificate of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	27	37
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	27	37
Other
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	2
Subtotal - current investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,459	2,531
Gross Unrealized Gains	0	1
Gross Unrealized Losses	15	8
Estimated Fair Value	$ 2,444	$ 2,524

X

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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