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Derivatives (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |  |
Cash received for partial termination of 1.125% Call Option |  | $ 578 | $ 477 |  |
Cash paid for partial termination of 1.125% Warrants |  | 514 | $ 419 |  |
Debt conversion, net cash receipts | $ 15 | $ 64 |  |  |
1.125% Convertible Notes |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Percentage of contractual interest rate on notes | 1.125% | 1.125% |  |  |
Percentage of contractual interest rate on Call Option | 1.125% | 1.125% |  |  |
1.125% Call Option |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Percentage of contractual interest rate on Call Option | 1.125% | 1.125% |  | 1.125% | 1.125%
Cash received for partial termination of 1.125% Call Option | $ 105 |  |  |  |
1.125% Conversion Option |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Percentage of contractual interest rate on Call Option | 1.125% | 1.125% |  |  | 1.125%
Current assets: Derivative asset | 1.125% Call Option |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative assets | $ 21 | $ 21 |  |  | $ 476
Current liabilities: Derivative liability | 1.125% Conversion Option |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liabilities | $ 21 | $ 21 |  |  | $ 476
1.125% Warrants |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Percentage of contractual interest rate on Call Option | 1.125% | 1.125% |  | 1.125% |
Cash paid for partial termination of 1.125% Warrants | $ 90 |  |  |  |

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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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