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Performance B.4.1. Share-based compensation - Cost of share based compensation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cost of share based compensation	$ (21)	$ (22)	$ (14)
2014 incentive plans
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cost of share based compensation	0	0	(1)
2015 incentive plans
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cost of share based compensation	0	(3)	(3)
2016 incentive plans
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cost of share based compensation	(4)	(6)	(10)
2017 incentive plans
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cost of share based compensation	(8)	(12)	0
2018 incentive plans
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cost of share based compensation	$ (11)	$ 0	$ 0

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

The amount of expense arising from share-based payment transactions in which the goods or services received did not qualify for recognition as assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2018-01-01
-Paragraph 51
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_51_a&doctype=Standard
-URIDate 2018-03-16

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