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Derivatives (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Derivative [Line Items] |  |  |
Cash received for partial termination of 1.125% Call Option | $ 134 | $ 0 |
Cash paid for partial termination of 1.125% Warrants | 113 | $ 0 |
Debt conversion, net cash receipts | $ 21 |  |
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% |  |
Cash received for partial termination of 1.125% Call Option | $ 134 |  |
Current assets: Derivative asset | 1.125% Call Option |  |  |
Derivative [Line Items] |  |  |
Derivative assets | 657 |  | $ 522
Current liabilities: Derivative liability | 1.125% Conversion Option derivative liability |  |  |
Derivative [Line Items] |  |  |
Derivative liabilities | 657 |  | $ 522
Cash Convertible Senior Notes Due 2020, Warrants |  |  |
Derivative [Line Items] |  |  |
Cash paid for partial termination of 1.125% Warrants | $ 113 |  |

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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