Stockholders' equity - Share buyback program (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
Nov. 30, 2018	Dec. 31, 2018
Stockholders' equity
Total aggregate price of purchased shares		$ 1,000
Common share
Stockholders' equity
Number of shares repurchased	71,173,683
Repurchased shares average price	$ 14.05
Total aggregate price of purchased shares	$ 1,000

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- Definition

The decrease in equity resulting from the purchase of treasury shares. [Refer: Treasury shares]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 106
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d&doctype=Standard
-URIDate 2019-03-27

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- Definition

The average price of shares that have been repurchased under a share buyback program.

+ References

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- Definition

Number of shares that have been repurchased at reporting date under a share buyback program.

+ References

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