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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Cost of share based compensation | $ (24) | $ (27) | $ (21)
2016 incentive plans |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Cost of share based compensation | 0 | 0 | (4)
2017 incentive plans |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Cost of share based compensation | 0 | (7) | (8)
2018 incentive plans |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Cost of share based compensation | (2) | (8) | (11)
2019 incentive plans |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Cost of share based compensation | (8) | (14) | 0
2020 incentive plans |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Cost of share based compensation | $ (13) | $ 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 2019-01-01 -Paragraph 51 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_51_a&doctype=Standard -URIDate 2019-03-27 + 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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