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Derivatives (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
1.125% Convertible Notes |  |
Derivative [Line Items] |  |
Percentage of contractual interest rate on Notes | 1.125% |
1.125% Call Option |  |
Derivative [Line Items] |  |
Percentage of contractual interest rate on Call Option | 1.125% |
1.125% Conversion Option derivative liability |  |
Derivative [Line Items] |  |
Percentage of contractual interest rate on Call Option | 1.125% |
Current assets: Derivative asset | 1.125% Call Option |  |
Derivative [Line Items] |  |
Derivative assets | $ 440 | $ 267
Current liabilities: Derivative liability | 1.125% Conversion Option derivative liability |  |
Derivative [Line Items] |  |
Derivative liabilities | $ 440 | $ 267

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