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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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