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Capital structure and financing - C.2. Dividend distributions (Details) - USD ($) $ / shares in Units, $ in Millions | May 17, 2018 | May 04, 2017 | May 17, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Share Capital, Reserves And Other Equity Interest And Financial Instruments [Abstract] |  |  |  |  |  |
Dividends recognised as distributions | $ 2.64 | $ 2.64 | $ 2.64 |  |  |
Statutory reserves unavailable for distribution |  |  |  | $ 324 | $ 345 | $ 321

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- Definition The amount, per share, of dividends recognised as distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 107 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_107&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Share Capital, Reserves And Other Equity Interest And Financial Instruments [Abstract] + References No definition available. + Details
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- Definition Statutory Reserves Unavailable For Distribution + References No definition available. + Details
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