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Post-employment benefits for associates - Additional information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of defined benefit plans [line items] |  |  |  |  |
Past service cost, net defined benefit liability (asset) |  | $ 12 |  |  |
Gains (losses) arising from settlements, net defined benefit liability (asset) |  | $ (12) |  |  |
Weighted average duration of defined benefit obligation |  |  | 15 years 6 months | 15 years 7 months 6 days |
Defined contribution plans charges |  |  | $ 136 | $ 128 | $ 105
Provisions and Other Non-current Liabilities [Member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Gains (losses) arising from settlements, net defined benefit liability (asset) | $ (164) |  |  |  |
Other Income [Member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Past service cost, net defined benefit liability (asset) | $ (164) |  |  |  |
Benefit obligation [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Top four countries, percentage |  |  | 86.00% |  |
Pension plans [member] | UNITED KINGDOM | Foreign countries [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Maximum number of years to eliminate shortfall |  |  | 10 years |  |
Other post-employment benefit plans [member] | Benefit obligation [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Associates covered, percentage |  |  | 99.00% |  |

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- Definition Associates Covered By Plan Percentage Of Defined Benefit Obligation + References No definition available. + Details
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- Definition Maximum Period Of Time To Eliminate Shortfall In Defined Benefit Plan + References No definition available. + 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 decrease (increase) in the net defined benefit liability (asset) resulting from settlements. Settlements are transactions that eliminate all further legal or constructive obligations for part or all of the benefits provided under a defined benefit plan, other than a payment of benefits to, or on behalf of, employees that is set out in the terms of the plan and included in the actuarial assumptions. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [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 d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 53 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_53&doctype=Standard -URIDate 2020-01-01 + Details
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