The amount, per share, of dividends recognised as distributions to owners.

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

Name:	ifrs-full_DividendsRecognisedAsDistributionsToOwnersPerShare
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

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
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