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Derivatives (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |  |  |
Cash received for partial settlement of call option |  | $ 578 | $ 623 | $ 0
Cash paid for partial termination of 1.125% Warrants |  | 514 | 549 | $ 0
Convertible debt, converted amount of instrument |  | $ 64 |  |
1.125% Convertible Notes |  |  |  |
Derivative [Line Items] |  |  |  |
Percentage of contractual interest rate |  | 1.125% |  |
1.125% Convertible Notes | Subsequent Event |  |  |  |
Derivative [Line Items] |  |  |  |
Cash received for partial settlement of call option | $ 27 |  |  |
1.125% Call Option |  |  |  |
Derivative [Line Items] |  |  |  |
Percentage of contractual interest rate on derivative |  | 1.125% |  |
1.125% Call Option | Subsequent Event |  |  |  |
Derivative [Line Items] |  |  |  |
Percentage of contractual interest rate on derivative | 1.125% |  |  |
1.125% Call Option | Current assets |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative asset |  | $ 29 | 476 |
1.125% Conversion Option |  |  |  |
Derivative [Line Items] |  |  |  |
Percentage of contractual interest rate on derivative |  | 1.125% |  |
1.125% Conversion Option | Current liabilities |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative liability |  | $ 29 | $ 476 |
1.125% Warrants |  |  |  |
Derivative [Line Items] |  |  |  |
Percentage of contractual interest rate on derivative |  | 1.125% |  |
Cash paid for partial termination of 1.125% Warrants |  | $ 514 |  |

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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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