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Fair Value Measurements - Financial Instruments on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | $ 2,025 | $ 2,175
Total liabilities measured at fair value on a recurring basis | 267 | 374
Corporate debt securities |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 1,179 | 1,184
Government-sponsored enterprise securities (GSEs) |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 231 | 211
Municipal securities |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 142 | 185
U.S. treasury notes |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 84 | 78
Asset-backed securities |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 69 | 63
Certificates of deposit |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 53 | 80
Subtotal - current investments |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 1,758 | 1,801
1.125% Call Option derivative asset |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 267 | 374
1.125% Conversion Option |  |
Fair value of assets measured on recurring basis |  |
1.125% Conversion Option derivative liability | 267 | 374
Level 1 |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 315 | 289
Total liabilities measured at fair value on a recurring basis | 0 | 0
Level 1 | Corporate debt securities |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Level 1 | Government-sponsored enterprise securities (GSEs) |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 231 | 211
Level 1 | Municipal securities |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Level 1 | U.S. treasury notes |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 84 | 78
Level 1 | Asset-backed securities |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Level 1 | Certificates of deposit |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Level 1 | Subtotal - current investments |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 315 | 289
Level 1 | 1.125% Call Option derivative asset |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 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 measured at fair value on a recurring basis | 1,443 | 1,512
Total liabilities measured at fair value on a recurring basis | 0 | 0
Level 2 | Corporate debt securities |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 1,179 | 1,184
Level 2 | Government-sponsored enterprise securities (GSEs) |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Level 2 | Municipal securities |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 142 | 185
Level 2 | U.S. treasury notes |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Level 2 | Asset-backed securities |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 69 | 63
Level 2 | Certificates of deposit |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 53 | 80
Level 2 | Subtotal - current investments |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 1,443 | 1,512
Level 2 | 1.125% Call Option derivative asset |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 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 measured at fair value on a recurring basis | 267 | 374
Total liabilities measured at fair value on a recurring basis | 267 | 374
Level 3 | Corporate debt securities |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Level 3 | Government-sponsored enterprise securities (GSEs) |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Level 3 | Municipal securities |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Level 3 | U.S. treasury notes |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Level 3 | Asset-backed securities |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Level 3 | Certificates of deposit |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Level 3 | Subtotal - current investments |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 0 | 0
Level 3 | 1.125% Call Option derivative asset |  |
Fair value of assets measured on recurring basis |  |
Total assets measured at fair value on a recurring basis | 267 | 374
Level 3 | 1.125% Conversion Option |  |
Fair value of assets measured on recurring basis |  |
1.125% Conversion Option derivative liability | $ 267 | $ 374

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