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Employee benefits - Actuarial and economic assumptions and sensitivity analysis (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Bottom of range [member] |  |
IfrsStatementLineItems [Line Items] |  |
Actuarial assumption of discount rates | 6.20% | 5.48%
Top of range [member] |  |
IfrsStatementLineItems [Line Items] |  |
Actuarial assumption of discount rates | 9.51% | 8.79%
Overfunded Pension Plans [Member] | Country of domicile [member] |  |
IfrsStatementLineItems [Line Items] |  |
Actuarial assumption of expected rates of pension increases |  | 3.25%
Actuarial assumption of expected rates of inflation | 3.50% | 3.25%
Overfunded Pension Plans [Member] | Country of domicile [member] | Actuarial assumption of discount rates [member] |  |
IfrsStatementLineItems [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | $ 2,451 |
Actuarial Assumption Of Discount Rate, Increase In Assumption | 10.83% |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ 2,845 |
Actuarial Assumption Of Discount Rate, Decrease In Assumption | 8.83% |
Overfunded Pension Plans [Member] | Country of domicile [member] | Bottom of range [member] |  |
IfrsStatementLineItems [Line Items] |  |
Actuarial assumption of discount rates | 9.77% | 8.62%
Actuarial assumption of nominal average rate of expense or income | 9.77% | 8.62%
Actuarial assumption of expected rates of salary increases | 3.50% | 3.25%
Actuarial assumption of expected rates of pension increases | 3.50% |
Overfunded Pension Plans [Member] | Country of domicile [member] | Top of range [member] |  |
IfrsStatementLineItems [Line Items] |  |
Actuarial assumption of discount rates | 9.88% | 8.82%
Actuarial assumption of nominal average rate of expense or income | 9.88% | 8.82%
Actuarial assumption of expected rates of salary increases | 5.36% | 5.32%
Actuarial assumption of expected rates of pension increases | 4.02% |
Overfunded Pension Plans [Member] | Foreign countries [member] |  |
IfrsStatementLineItems [Line Items] |  |
Actuarial assumption of discount rates | 5.10% |
Actuarial assumption of nominal average rate of expense or income | 2.84% |
Actuarial assumption of expected rates of salary increases | 3.23% |
Actuarial assumption of expected rates of pension increases | 3.00% |
Actuarial assumption of expected rates of inflation | 2.06% |
Overfunded Pension Plans [Member] | Foreign countries [member] | Actuarial assumption of discount rates [member] |  |
IfrsStatementLineItems [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | $ 2,244 |
Actuarial Assumption Of Discount Rate, Increase In Assumption | 6.11% |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ 2,799 |
Actuarial Assumption Of Discount Rate, Decrease In Assumption | 4.11% |
Underfunded Pension Plans [Member] | Country of domicile [member] |  |
IfrsStatementLineItems [Line Items] |  |
Actuarial assumption of discount rates | 10.66% | 10.25%
Actuarial assumption of nominal average rate of expense or income | 10.66% | 10.25%
Actuarial assumption of expected rates of salary increases | 6.86% | 7.50%
Actuarial assumption of expected rates of pension increases | 6.86% | 7.50%
Actuarial assumption of expected rates of inflation | 4.25% | 5.00%
Underfunded Pension Plans [Member] | Country of domicile [member] | Actuarial assumption of discount rates [member] |  |
IfrsStatementLineItems [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | $ 237 |
Actuarial Assumption Of Discount Rate, Increase In Assumption | 11.66% |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ 257 |
Actuarial Assumption Of Discount Rate, Decrease In Assumption | 9.66% |
Underfunded Pension Plans [Member] | Foreign countries [member] |  |
IfrsStatementLineItems [Line Items] |  |
Actuarial assumption of discount rates | 5.10% | 2.84%
Actuarial assumption of nominal average rate of expense or income | 2.84% | 2.62%
Actuarial assumption of expected rates of salary increases | 3.23% | 3.28%
Actuarial assumption of expected rates of pension increases | 3.00% | 3.00%
Actuarial assumption of expected rates of inflation | 2.06% | 2.10%
Underfunded Pension Plans [Member] | Foreign countries [member] | Actuarial assumption of discount rates [member] |  |
IfrsStatementLineItems [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | $ 322 |
Actuarial Assumption Of Discount Rate, Increase In Assumption | 6.11% |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ 403 |
Actuarial Assumption Of Discount Rate, Decrease In Assumption | 4.11% |
Other Benefits [Member] | Country of domicile [member] |  |
IfrsStatementLineItems [Line Items] |  |
Actuarial assumption of medical cost trend rates | 6.35% | 6.35%
Actuarial assumption of ultimate medical cost trend rates | 6.35% | 6.35%
Actuarial assumption of expected rates of inflation | 3.50% |
Other Benefits [Member] | Country of domicile [member] | Actuarial assumption of discount rates [member] |  |
IfrsStatementLineItems [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | $ 413 |
Actuarial Assumption Of Discount Rate, Increase In Assumption | 10.86% |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ 320 |
Actuarial Assumption Of Discount Rate, Decrease In Assumption | 8.86% |
Other Benefits [Member] | Country of domicile [member] | Bottom of range [member] |  |
IfrsStatementLineItems [Line Items] |  |
Actuarial assumption of discount rates | 9.81% | 8.68%
Other Benefits [Member] | Country of domicile [member] | Top of range [member] |  |
IfrsStatementLineItems [Line Items] |  |
Actuarial assumption of discount rates | 9.90% | 8.86%
Other Benefits [Member] | Foreign countries [member] |  |
IfrsStatementLineItems [Line Items] |  |
Actuarial assumption of discount rates | 5.14% | 3.03%
Actuarial assumption of nominal average rate of expense or income | 3.03% | 2.62%
Actuarial assumption of medical cost trend rates | 5.11% | 5.11%
Actuarial assumption of ultimate medical cost trend rates | 4.57% | 4.57%
Other Benefits [Member] | Foreign countries [member] | Actuarial assumption of discount rates [member] |  |
IfrsStatementLineItems [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | $ 649 |
Actuarial Assumption Of Discount Rate, Increase In Assumption | 6.14% |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ 832 |
Actuarial Assumption Of Discount Rate, Decrease In Assumption | 4.14% |

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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_144&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_144&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The expected rate of increases in pension that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_144&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_144&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition Medical cost trend rate used as significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_144&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_a&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_a&doctype=Standard -URIDate 2022-03-24 + Details
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