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Performance B.4.1. Share-based compensation - Cost of share based compensation (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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- 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 + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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