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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
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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