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Employee benefits - Reconciliation of net liabilities recognized in the statement of financial position (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Overfunded pension plans | Present value of actuarial liabilities |  |
Reconciliation of net liabilities recognized in the statement of financial position |  |
Net liabilities recognized | $ (3,183) | $ (3,105)
Overfunded pension plans | Fair value of assets |  |
Reconciliation of net liabilities recognized in the statement of financial position |  |
Net liabilities recognized | 4,045 | 3,969
Overfunded pension plans | Effect of the asset ceiling |  |
Reconciliation of net liabilities recognized in the statement of financial position |  |
Net liabilities recognized | (862) | (864)
Underfunded pension plans |  |
Reconciliation of net liabilities recognized in the statement of financial position |  |
Net liabilities recognized | (343) | (641)
Current liabilities | (41) | (47)
Non-current liabilities | (302) | (594)
Liabilities | (343) | (641)
Underfunded pension plans | Present value of actuarial liabilities |  |
Reconciliation of net liabilities recognized in the statement of financial position |  |
Net liabilities recognized | (4,440) | (4,632)
Underfunded pension plans | Fair value of assets |  |
Reconciliation of net liabilities recognized in the statement of financial position |  |
Net liabilities recognized | 4,097 | 3,991
Other benefits |  |
Reconciliation of net liabilities recognized in the statement of financial position |  |
Net liabilities recognized | (1,668) | (1,733)
Current liabilities | (72) | (96)
Non-current liabilities | (1,596) | (1,637)
Liabilities | (1,668) | (1,733)
Other benefits | Present value of actuarial liabilities |  |
Reconciliation of net liabilities recognized in the statement of financial position |  |
Net liabilities recognized | $ (1,668) | $ (1,733)

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- Definition The amount of current provisions for employee benefits. [Refer: Provisions for employee benefits] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_d&doctype=Standard -URIDate 2020-01-01 + Details
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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 deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_140_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of non-current provisions for employee benefits. [Refer: Provisions for employee benefits] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of provisions for employee benefits. [Refer: Employee benefits expense; Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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