Assets and liabilities classified as held for sale - Summary of assets and liabilities classified as held for sale (Details) $ in Millions	Dec. 31, 2019 USD ($)
Assets and liabilities classified as held for sale [line items]
Non current assets classified as held for sale	$ 19
Current and non current assets classified as held for sale	19
Liabilities classified as held for sale	(22)
Property, plant and equipment [Member]
Assets and liabilities classified as held for sale [line items]
Non current assets classified as held for sale	3
Right-of-use assets [Member]
Assets and liabilities classified as held for sale [line items]
Non current assets classified as held for sale	15
Trade and other receivables [Member]
Assets and liabilities classified as held for sale [line items]
Current assets classified as held for sale	1
Trade and other payable [Member]
Assets and liabilities classified as held for sale [line items]
Liabilities classified as held for sale	(2)
Lease liabilities [member]
Assets and liabilities classified as held for sale [line items]
Liabilities classified as held for sale	$ (20)

The amount of liabilities included in disposal groups classified as held for sale. [Refer: Liabilities; Disposal groups classified as held for sale [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 5
-IssueDate 2019-01-01
-Paragraph 38
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2019-en-r&anchor=para_38&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 54
-Subparagraph p
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_p&doctype=Standard
-URIDate 2019-03-27

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- Definition

The amount of non-current assets or disposal groups classified as held for sale. [Refer: Disposal groups classified as held for sale [member]]

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- Definition

Disclosure Of Assets And Liabilitites Classified As Held For Sale

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