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Summary of significant accounting policies - Narrative (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
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 | $ 789 | $ 674 | $ 620 |
Present value of lease liabilities | 528 |  |  |
Operating lease, Right-of-use asset | $ 469 |  |  |
Accounting Standards Update 2016-02 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Present value of lease liabilities |  |  |  | $ 510
Operating lease, Right-of-use asset |  |  |  | $ 439
Minimum [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenue payment term | 30 days |  |  |
Maximum [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenue payment term | 120 days |  |  |

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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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