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Derivatives (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative [Line Items] |  |  |  |  |  |
Cash received for partial settlement of 1.125% Call Option |  |  |  | $ 623 | $ 0 | $ 0
Cash paid for partial termination of 1.125% Warrants |  |  |  | $ 549 | 0 | $ 0
Convertible debt, converted amount of instrument | $ 16 | $ 37 | $ 21 |  |  |
1.125% Convertible Notes |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Percentage of contractual interest rate | 1.125% |  |  | 1.125% |  |
1.125% Call Option |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fixed interest rate on derivative | 1.125% |  |  | 1.125% |  |
1.125% Call Option | Current assets |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative asset | $ 476 |  |  | $ 476 | 522 |
1.125% Conversion Option |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Cash received for partial settlement of 1.125% Call Option | $ 146 | 343 | 134 |  |  |
Fixed interest rate on derivative | 1.125% |  |  | 1.125% |  |
1.125% Conversion Option | Current liabilities |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative liability | $ 476 |  |  | $ 476 | $ 522 |
1.125% Warrants |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Cash paid for partial termination of 1.125% Warrants | $ 130 | $ 306 | $ 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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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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