Pensions and Post-Employment Benefits - Sensitivity Analysis of Pension and Other Post-Employment Benefits (Detail) $ in Millions	Dec. 31, 2023 USD ($)
Actuarial assumption of discount rates [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	$ (99)
Sensitivity, possible decrease in actuarial assumption	108
Actuarial assumption of expected rates of salary increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	5
Sensitivity, possible decrease in actuarial assumption	(5)
Actuarial assumption of expected rates of pension increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	73
Sensitivity, possible decrease in actuarial assumption	(68)
Pension defined benefit plans [member] \| Actuarial assumption of discount rates [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	(95)
Sensitivity, possible decrease in actuarial assumption	104
Pension defined benefit plans [member] \| Actuarial assumption of expected rates of salary increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	4
Sensitivity, possible decrease in actuarial assumption	(4)
Pension defined benefit plans [member] \| Actuarial assumption of expected rates of pension increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	73
Sensitivity, possible decrease in actuarial assumption	(68)
Other post employment benefits [Member] \| Actuarial assumption of discount rates [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	(4)
Sensitivity, possible decrease in actuarial assumption	4
Other post employment benefits [Member] \| Actuarial assumption of expected rates of salary increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	1
Sensitivity, possible decrease in actuarial assumption	$ (1)

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

No definition available.

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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
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-Number 19
-IssueDate 2023-01-01
-Paragraph 145
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-URIDate 2023-03-23

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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

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