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Employee benefits - Reconciliation of net liabilities recognized in the statement of financial position (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 income |  | 84 | [1] | 58
Changes on asset ceiling |  | 65 | [1] | 60
Translation adjustment |  | 46 | [1] | (63)
Benefit obligation (Plan assets) as at end of the year | [1] | 1,114 |  | 919
Net defined benefit liability (asset) | [1] | 84 |  |
Non-current provisions for employee benefits | [1] | 84 |  |
Provisions for employee benefits | [1] | 84 |  |
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
Interest income |  | 325 |  | 196
Translation adjustment |  | 5 |  | (208)
Benefit obligation (Plan assets) as at end of the year |  | 5,142 |  | 2,833
Overfunded Pension Plans [Member] | Plan assets [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Benefit obligation (Plan assets) as at beginning of the year |  | 3,752 |  | 3,969
Interest income |  | 412 |  | 253
Translation adjustment |  | 44 |  | (276)
Benefit obligation (Plan assets) as at end of the year |  | 6,340 |  | 3,752
Net defined benefit liability (asset) |  | 6,340 | [1] | 3,752
Overfunded Pension Plans [Member] | Effect of asset ceiling [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | (1,114) | [1] | (919)
Overfunded Pension Plans [Member] | Present Value Of Defined Benefit Obligations [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | (5,142) | [1] | (2,833)
Overfunded Pension Plans [Member] | Country of domicile [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Benefit obligation (Plan assets) as at beginning of the year |  | 876 |  | 864
Interest income |  | 83 |  | 58
Changes on asset ceiling |  | (89) |  | 16
Translation adjustment |  | 54 |  | (62)
Benefit obligation (Plan assets) as at end of the year |  | 924 |  | 876
Overfunded Pension Plans [Member] | Country of domicile [member] | Present value of defined benefit obligation [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | (2,634) |  | (2,572)
Overfunded Pension Plans [Member] | Country of domicile [member] | Plan assets [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | 3,558 |  | 3,448
Overfunded Pension Plans [Member] | Country of domicile [member] | Effect of asset ceiling [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | (924) |  | (876)
Overfunded Pension Plans [Member] | Foreign countries [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Benefit obligation (Plan assets) as at beginning of the year |  | 44 |  |
Interest income |  | 1 |  |
Changes on asset ceiling |  | 160 |  | 44
Translation adjustment |  | (15) |  |
Benefit obligation (Plan assets) as at end of the year |  | 190 |  | 44
Net defined benefit liability (asset) |  | 84 |  |
Non-current provisions for employee benefits |  | 84 |  |
Provisions for employee benefits |  | 84 |  |
Overfunded Pension Plans [Member] | Foreign countries [member] | Present value of defined benefit obligation [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | (2,508) |  | (261)
Overfunded Pension Plans [Member] | Foreign countries [member] | Plan assets [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | 2,782 |  | 305
Overfunded Pension Plans [Member] | Foreign countries [member] | Effect of asset ceiling [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | (190) |  | (44)
Underfunded Pension Plans [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | (269) |  | (204)
Current provisions for employee benefits |  | (10) |  | (47)
Non-current provisions for employee benefits |  | (259) |  | (157)
Provisions for employee benefits |  | (269) |  | (204)
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
Interest income |  | 39 |  | 122
Translation adjustment |  | (5) |  | (10)
Benefit obligation (Plan assets) as at end of the year |  | 608 |  | 3,983
Underfunded Pension Plans [Member] | Plan assets [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Benefit obligation (Plan assets) as at beginning of the year |  | 3,779 |  | 3,992
Interest income |  | 17 |  | 102
Translation adjustment |  | (9) |  | 2
Benefit obligation (Plan assets) as at end of the year |  | 339 |  | 3,779
Net defined benefit liability (asset) |  | 339 |  | 3,779
Underfunded Pension Plans [Member] | Present Value Of Defined Benefit Obligations [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | (608) |  | (3,983)
Underfunded Pension Plans [Member] | Country of domicile [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | (145) |  | (143)
Current provisions for employee benefits |  | (3) |  | (40)
Non-current provisions for employee benefits |  | (142) |  | (103)
Provisions for employee benefits |  | (145) |  | (143)
Underfunded Pension Plans [Member] | Country of domicile [member] | Present value of defined benefit obligation [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | (246) |  | (237)
Underfunded Pension Plans [Member] | Country of domicile [member] | Plan assets [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | 101 |  | 94
Underfunded Pension Plans [Member] | Foreign countries [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | (124) |  | (61)
Current provisions for employee benefits |  | (7) |  | (7)
Non-current provisions for employee benefits |  | (117) |  | (54)
Provisions for employee benefits |  | (124) |  | (61)
Underfunded Pension Plans [Member] | Foreign countries [member] | Present value of defined benefit obligation [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | (362) |  | (3,746)
Underfunded Pension Plans [Member] | Foreign countries [member] | Plan assets [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | 238 |  | 3,685
Other Benefits [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | (1,057) |  | (1,428)
Current provisions for employee benefits |  | (56) |  | (52)
Non-current provisions for employee benefits |  | (1,001) |  | (1,376)
Provisions for employee benefits |  | (1,057) |  | (1,428)
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
Interest income |  | 60 |  | 33
Translation adjustment |  | (24) |  | (23)
Benefit obligation (Plan assets) as at end of the year |  | 1,057 |  | 1,427
Other Benefits [Member] | Plan assets [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Benefit obligation (Plan assets) as at beginning of the year |  |  |  |
Benefit obligation (Plan assets) as at end of the year |  |  |  |
Other Benefits [Member] | Present Value Of Defined Benefit Obligations [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | (1,057) |  | (1,428)
Other Benefits [Member] | Country of domicile [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | (321) |  | (301)
Current provisions for employee benefits |  | (16) |  | (5)
Non-current provisions for employee benefits |  | (305) |  | (296)
Provisions for employee benefits |  | (321) |  | (301)
Other Benefits [Member] | Country of domicile [member] | Present value of defined benefit obligation [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | (321) |  | (301)
Other Benefits [Member] | Foreign countries [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | (736) |  | (1,127)
Current provisions for employee benefits |  | (40) |  | (47)
Non-current provisions for employee benefits |  | (696) |  | (1,080)
Provisions for employee benefits |  | (736) |  | (1,127)
Other Benefits [Member] | Foreign countries [member] | Present value of defined benefit obligation [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net defined benefit liability (asset) |  | $ (736) |  | $ (1,127)
[1] | The pension plan asset is recorded as “Other non-current assets” in the balance sheet.

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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 2022-03-24 -Paragraph 78 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78_d&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the gain (loss) on changes in the effect of limiting a net defined benefit asset to the asset ceiling, excluding amounts included in interest income or expense. [Refer: Interest income (expense); Net defined benefit liability (asset); Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 141 -Subparagraph c -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_c_iv&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 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 2022-03-24 -Paragraph 78 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78_d&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 78 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78_d&doctype=Standard -URIDate 2022-03-24 + Details
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