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Employee benefits - Change in benefit obligation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Overfunded Pension Plans [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Benefit obligation (Plan assets) as at beginning of the year |  | $ 919 | [1] | $ 864
Interest costs |  | 84 | [1] | 58
Translation adjustment |  | 46 | [1] | (63)
Benefit obligation (Plan assets) as at end of the year | [1] | 1,114 |  | 919
Overfunded Pension Plans [Member] | Country of domicile [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Benefit obligation (Plan assets) as at beginning of the year |  | 876 |  | 864
Interest costs |  | 83 |  | 58
Translation adjustment |  | 54 |  | (62)
Benefit obligation (Plan assets) as at end of the year |  | 924 |  | 876
Overfunded Pension Plans [Member] | Present value of defined benefit obligation [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Benefit obligation (Plan assets) as at beginning of the year |  | 2,833 |  | 3,105
Service costs |  | 45 |  |
Interest costs |  | 325 |  | 196
Benefits paid |  | (534) |  | (235)
Effect of changes in the actuarial assumptions |  | (784) |  | (330)
Translation adjustment |  | 5 |  | (208)
Transfers |  | 3,252 |  | 295
Benefit obligation (Plan assets) as at end of the year |  | 5,142 |  | 2,833
Overfunded Pension Plans [Member] | Present value of defined benefit obligation [member] | Country of domicile [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Service costs |  |  |  | 10
Underfunded Pension Plans [Member] | Present value of defined benefit obligation [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Benefit obligation (Plan assets) as at beginning of the year |  | 3,983 |  | 4,632
Service costs |  | 40 |  | 68
Interest costs |  | 39 |  | 122
Benefits paid |  | (58) |  | (257)
Participant contributions |  | (30) |  | (31)
Effect of changes in the actuarial assumptions |  | (109) |  | (246)
Translation adjustment |  | (5) |  | (10)
Transfers |  | (3,252) |  | (295)
Benefit obligation (Plan assets) as at end of the year |  | 608 |  | 3,983
Other Benefits [Member] | Present value of defined benefit obligation [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Benefit obligation (Plan assets) as at beginning of the year |  | 1,427 |  | 1,733
Service costs |  | 13 |  | 1
Interest costs |  | 60 |  | 33
Benefits paid |  | (57) |  | (56)
Effect of changes in the actuarial assumptions |  | (343) |  | (261)
Translation adjustment |  | (24) |  | (23)
Other |  | (19) |  |
Benefit obligation (Plan assets) as at end of the year |  | $ 1,057 |  | $ 1,427
[1] | The pension plan asset is recorded as “Other non-current assets” in the balance sheet.

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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 141 -Subparagraph c -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_c_iii&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [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 2022-03-24 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_f&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 141 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_a&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 141 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_e&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 141 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_b&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_140_a&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 141 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_g&doctype=Standard -URIDate 2022-03-24 + Details
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