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Summary of significant accounting policies (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2019 USD ($)
Accounting Policies [Abstract] |  |  |  |
Number of business segment | segment | 1 |  |  |
Change in estimate of sales deductions for prior period sales as a pct of total sales deductions (less than) | 1.00% |  |  |
Sales return provisions as a percentage of gross product sales (less than) | 1.00% |  |  |
Advertising cost | $ 674 | $ 620 | $ 489 |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Accumulated deficit | $ (17,977) | (5,072) |  |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Accumulated deficit |  | $ 25 |  |
Minimum [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenue payment term | 30 days |  |  |
Minimum [Member] | Scenario, Forecast [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating lease, liability |  |  |  | $ 400
Operating lease, Right-of-use asset |  |  |  | 400
Maximum [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenue payment term | 120 days |  |  |
Maximum [Member] | Scenario, Forecast [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating lease, liability |  |  |  | 450
Operating lease, Right-of-use asset |  |  |  | $ 450

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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