The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2016-01-13
-Paragraph 137
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_137_a&doctype=Standard
-URIDate 2016-03-31

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

Other information (Details) - USD ($) $ / shares in Units, $ in Millions	Feb. 28, 2018	Dec. 31, 2017
Restricted net assets [Abstract]
Restricted net assets		$ 566
Subsequent Event [Member]
Subsequent Events [Abstract]
Dividends declared (in dollars per share)	$ 0.31