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Fair Value Measurements - Financial Instruments on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Fair value of assets measured on recurring basis
Total assets	$ 2,157	$ 3,215
Total liabilities	476	522
Corporate debt securities
Fair value of assets measured on recurring basis
Total assets		101
U.S. Treasury notes
Fair value of assets measured on recurring basis
Total assets		68
Subtotal - current restricted investments
Fair value of assets measured on recurring basis
Total assets		169
Corporate debt securities
Fair value of assets measured on recurring basis
Total assets	1,123	1,588
U.S. Treasury notes
Fair value of assets measured on recurring basis
Total assets	181	388
Government-sponsored enterprise securities (GSEs)
Fair value of assets measured on recurring basis
Total assets	163	253
Municipal securities
Fair value of assets measured on recurring basis
Total assets	114	141
Asset-backed securities
Fair value of assets measured on recurring basis
Total assets	82	117
Certificates of deposit
Fair value of assets measured on recurring basis
Total assets	14	37
Other
Fair value of assets measured on recurring basis
Total assets	4
Subtotal - current investments
Fair value of assets measured on recurring basis
Total assets	1,681	2,524
1.125% Call Option derivative asset
Fair value of assets measured on recurring basis
Total assets	476	522
Level 1
Fair value of assets measured on recurring basis
Total assets	0	0
Total liabilities	0	0
Level 1 | Corporate debt securities
Fair value of assets measured on recurring basis
Total assets		0
Level 1 | U.S. Treasury notes
Fair value of assets measured on recurring basis
Total assets		0
Level 1 | Subtotal - current restricted investments
Fair value of assets measured on recurring basis
Total assets		0
Level 1 | Corporate debt securities
Fair value of assets measured on recurring basis
Total assets	0	0
Level 1 | U.S. Treasury notes
Fair value of assets measured on recurring basis
Total assets	0	0
Level 1 | Government-sponsored enterprise securities (GSEs)
Fair value of assets measured on recurring basis
Total assets	0	0
Level 1 | Municipal securities
Fair value of assets measured on recurring basis
Total assets	0	0
Level 1 | Asset-backed securities
Fair value of assets measured on recurring basis
Total assets	0	0
Level 1 | Certificates of deposit
Fair value of assets measured on recurring basis
Total assets	0	0
Level 1 | Other
Fair value of assets measured on recurring basis
Total assets	0
Level 1 | Subtotal - current investments
Fair value of assets measured on recurring basis
Total assets	0	0
Level 1 | 1.125% Call Option derivative asset
Fair value of assets measured on recurring basis
Total assets	0	0
Level 1 | 1.125% Conversion Option
Fair value of assets measured on recurring basis
1.125% Conversion Option derivative liability	0	0
Level 2
Fair value of assets measured on recurring basis
Total assets	1,681	2,693
Total liabilities	0	0
Level 2 | Corporate debt securities
Fair value of assets measured on recurring basis
Total assets		101
Level 2 | U.S. Treasury notes
Fair value of assets measured on recurring basis
Total assets		68
Level 2 | Subtotal - current restricted investments
Fair value of assets measured on recurring basis
Total assets		169
Level 2 | Corporate debt securities
Fair value of assets measured on recurring basis
Total assets	1,123	1,588
Level 2 | U.S. Treasury notes
Fair value of assets measured on recurring basis
Total assets	181	388
Level 2 | Government-sponsored enterprise securities (GSEs)
Fair value of assets measured on recurring basis
Total assets	163	253
Level 2 | Municipal securities
Fair value of assets measured on recurring basis
Total assets	114	141
Level 2 | Asset-backed securities
Fair value of assets measured on recurring basis
Total assets	82	117
Level 2 | Certificates of deposit
Fair value of assets measured on recurring basis
Total assets	14	37
Level 2 | Other
Fair value of assets measured on recurring basis
Total assets	4
Level 2 | Subtotal - current investments
Fair value of assets measured on recurring basis
Total assets	1,681	2,524
Level 2 | 1.125% Call Option derivative asset
Fair value of assets measured on recurring basis
Total assets	0	0
Level 2 | 1.125% Conversion Option
Fair value of assets measured on recurring basis
1.125% Conversion Option derivative liability	0	0
Level 3
Fair value of assets measured on recurring basis
Total assets	476	522
Total liabilities	476	522
Level 3 | Corporate debt securities
Fair value of assets measured on recurring basis
Total assets		0
Level 3 | U.S. Treasury notes
Fair value of assets measured on recurring basis
Total assets		0
Level 3 | Subtotal - current restricted investments
Fair value of assets measured on recurring basis
Total assets		0
Level 3 | Corporate debt securities
Fair value of assets measured on recurring basis
Total assets	0	0
Level 3 | U.S. Treasury notes
Fair value of assets measured on recurring basis
Total assets	0	0
Level 3 | Government-sponsored enterprise securities (GSEs)
Fair value of assets measured on recurring basis
Total assets	0	0
Level 3 | Municipal securities
Fair value of assets measured on recurring basis
Total assets	0	0
Level 3 | Asset-backed securities
Fair value of assets measured on recurring basis
Total assets	0	0
Level 3 | Certificates of deposit
Fair value of assets measured on recurring basis
Total assets	0	0
Level 3 | Other
Fair value of assets measured on recurring basis
Total assets	0
Level 3 | Subtotal - current investments
Fair value of assets measured on recurring basis
Total assets	0	0
Level 3 | 1.125% Call Option derivative asset
Fair value of assets measured on recurring basis
Total assets	476	522
Level 3 | 1.125% Conversion Option
Fair value of assets measured on recurring basis
1.125% Conversion Option derivative liability	$ 476	$ 522

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