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Investments - Schedule of Investments (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Investments
Amortized Cost	$ 2,700	$ 1,761
Gross Unrealized Gains	1	1
Gross Unrealized Losses	8	4
Estimated Fair Value	2,693	1,758
U.S. treasury notes
Investments
Amortized Cost	68
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	68
Corporate debt securities
Investments
Amortized Cost	101
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	101
Subtotal - current restricted investments
Investments
Amortized Cost	169
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	169
Corporate debt securities
Investments
Amortized Cost	1,591	1,180
Gross Unrealized Gains	1	1
Gross Unrealized Losses	4	2
Estimated Fair Value	1,588	1,179
U.S. treasury notes
Investments
Amortized Cost	389	84
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1	0
Estimated Fair Value	388	84
GSEs
Investments
Amortized Cost	255	232
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2	1
Estimated Fair Value	253	231
Municipal securities
Investments
Amortized Cost	142	143
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1	1
Estimated Fair Value	141	142
Asset-backed securities
Investments
Amortized Cost	117	69
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	117	69
Certificates of deposit
Investments
Amortized Cost	37	53
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	37	$ 53
Subtotal - current investments
Investments
Amortized Cost	2,531
Gross Unrealized Gains	1
Gross Unrealized Losses	8
Estimated Fair Value	$ 2,524

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