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Post-employment benefits for associates - Reconciliation of net liability (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Past service costs and settlements | $ (154) | $ 2 | $ 1
Pension plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Net defined benefit liability | (278) | (242) |
Current service cost | (31) | (22) |
Net interest expense | (5) | (5) |
Administrative expenses | (1) | (1) |
Past service costs and settlements | (11) | (2) |
Remeasurements | 5 | (36) |
Currency translation effects | (20) | 6 |
Employer contributions | 25 | 21 |
Effect of acquisitions, divestments or transfers | 12 | 5 |
Change in limitation on recognition of fund surplus | (11) | (2) |
Net defined benefit liability | (315) | (278) | (242)
Other post-employment benefit plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Net defined benefit liability | (423) | (345) |
Current service cost | (14) | (8) |
Net interest expense | (15) | (14) |
Administrative expenses | 0 | 0 |
Past service costs and settlements | 165 | 0 |
Remeasurements | (61) | (28) |
Currency translation effects | 0 | 0 |
Employer contributions | 16 | (28) |
Effect of acquisitions, divestments or transfers | 0 | 0 |
Change in limitation on recognition of fund surplus | 0 | 0 |
Net defined benefit liability | (332) | (423) | $ (345)
Prepaid benefit cost [member] | Pension plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Net defined benefit liability | 13 |  |
Net defined benefit liability | 24 | 13 |
Prepaid benefit cost [member] | Other post-employment benefit plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Net defined benefit liability | 0 |  |
Net defined benefit liability | 0 | 0 |
Accrued benefit liability [member] | Pension plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Net defined benefit liability | (291) |  |
Net defined benefit liability | (339) | (291) |
Accrued benefit liability [member] | Other post-employment benefit plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Net defined benefit liability | (423) |  |
Net defined benefit liability | $ (332) | $ (423) |

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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_f&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from business combinations and disposals. [Refer: Business combinations [member]; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_h&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_b&doctype=Standard -URIDate 2020-01-01 + 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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