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Pensions and Post-Employment Benefits - Sensitivity Analysis of Pension and Other Post-Employment Benefits (Detail) $ in Millions	Dec. 31, 2021 USD ($)
Actuarial assumption of discount rates [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	$ (183)
Sensitivity, possible decrease in actuarial assumption	205
Actuarial assumption of expected rates of salary increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	7
Sensitivity, possible decrease in actuarial assumption	(6)
Actuarial assumption of expected rates of pension increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Sensitivity, possible increase in actuarial assumption	124
Sensitivity, possible decrease in actuarial assumption	(121)
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	(178)
Sensitivity, possible decrease in actuarial assumption	200
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	6
Sensitivity, possible decrease in actuarial assumption	(5)
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	124
Sensitivity, possible decrease in actuarial assumption	(121)
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	(5)
Sensitivity, possible decrease in actuarial assumption	5
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)

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+ References

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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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- 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
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