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Employee Benefits - Summary of Sensitivity Analysis of Defined Benefit Obligation for Weighted Principle Assumption (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($)
Discount Rate [Member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Change in assumption | 0.50%
Increase in assumption | $ (482)
Decrease in assumption | $ 533
Price inflation [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Change in assumption | 0.50%
Increase in assumption | $ 175
Decrease in assumption | $ (183)
Future Salary Increases [Member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Change in assumption | 0.50%
Increase in assumption | $ 26
Decrease in assumption | $ (25)
Medical Cost Trend Rate [Member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Change in assumption | 1.00%
Increase in assumption | $ 30
Decrease in assumption | $ (26)
Longevity [Member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Change in assumption | One year
Increase in assumption | $ 256
Decrease in assumption | $ (255)

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- Definition Longevity of reasonably possible increase in actuarial assumption. + References No definition available. + 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 2021-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_145_a&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_145_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_145_a&doctype=Standard -URIDate 2021-03-24 + Details
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