Acquisitions and divestitures - Cash flows of discontinued operations (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Discontinued operations
Net cash used in discontinued operations	$ (46)	$ (252)
Discontinued operations
Discontinued operations
Net cash provided by (used in) operating activities	(37)	87
Net cash provided (used) in investing activities	(9)	(305)
Net cash used in financing activities		(34)
Net cash used in discontinued operations	$ (46)	$ (252)

The cash flows from (used in) the entity's financing activities, related to discontinued operations. [Refer: Discontinued operations [member]; Cash flows from (used in) financing activities]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 5
-IssueDate 2019-01-01
-Paragraph 33
-Subparagraph c
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-URIDate 2019-03-27

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- Definition

The cash flows from (used in) the entity's investing activities, related to discontinued operations. [Refer: Discontinued operations [member]; Cash flows from (used in) investing activities]

+ References

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- Definition

The cash flows from (used in) the entity's operating activities, related to discontinued operations. [Refer: Discontinued operations [member]; Cash flows from (used in) operating activities]

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- Definition

The increase (decrease) in cash and cash equivalents from discontinued operations. [Refer: Cash and cash equivalents; Discontinued operations [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 5
-IssueDate 2019-01-01
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-URIDate 2019-03-27

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- References

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