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Investments - Schedule of Investments (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Investments
Amortized Cost	$ 1,692	$ 2,700
Gross Unrealized Gains	0	1
Gross Unrealized Losses	11	8
Estimated Fair Value	1,681	2,693
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	1,131	1,591
Gross Unrealized Gains	0	1
Gross Unrealized Losses	8	4
Estimated Fair Value	1,123	1,588
U.S. Treasury notes
Investments
Amortized Cost	181	389
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	1
Estimated Fair Value	181	388
GSEs
Investments
Amortized Cost	164	255
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1	2
Estimated Fair Value	163	253
Municipal securities
Investments
Amortized Cost	115	142
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1	1
Estimated Fair Value	114	141
Asset-backed securities
Investments
Amortized Cost	83	117
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1	0
Estimated Fair Value	82	117
Certificates of deposit
Investments
Amortized Cost	14	37
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	14	37
Other
Investments
Amortized Cost	4
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	$ 4
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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