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Additional disclosure items G.4. Non-cash investing and financing activity (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Additional information [abstract] |  |  |
Acquisition of property, plant and equipment, including (finance) leases | $ (27) | $ 17 | $ (65)
Asset retirement obligations | 19 | 19 | 15
(Finance) Leases | (1) | (1) | (43)
Share based compensation | $ 24 | $ 27 | $ 21

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- References No definition available. + Details
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- Definition The increase in liabilities arising from financing activities resulting from new leases. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Section A Statement of cash flows for an entity other than a financial institution -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&doctype=Illustrative%20Examples&dita_xref=IAS07_IE_A_TI -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 44B -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_44B&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Non-cash Acquisition of Property, Plant and Equipment + References No definition available. + Details
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- Definition Non-cash Increase (Decrease) in Provision for Decommissioning, Restoration and Rehabilitation Costs + References No definition available. + Details
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- Definition Share-Based Compensation Expense, Financing Activities + References No definition available. + Details
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