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Post-retirement benefits - Additional information (Detail) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 EUR (€)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Disclosure of defined benefit plans [Line Items]
Securities included in fair value of plan assets		$ 2	$ 4
Defined benefit expenses excluded form unerlying earnings		0	$ 0	$ 0
Excess of service cost over cash paid to defined contribution plans		4
Estimated contributions to defined benefit pension plans for 2022		$ 180
Defined benefit obligation weighted average expected future life time	27 years	27 years	27 years
Defined benefit obligation weighted average expected future life time at man aged 60 in 2040	28 years	28 years	28 years
Present value of defined benefit obligation
Disclosure of defined benefit plans [Line Items]
Past service cost		$ 2	$ 2
Settlements		$ 380	$ 6
Healthcare plans
Disclosure of defined benefit plans [Line Items]
Discount rate		3.10%	2.50%
Medical trend rate (%)		6.30%	6.30%
Reduction in medical trend rate (%)		4.70%	4.60%
UK
Disclosure of defined benefit plans [Line Items]
Past service cost			$ 1
Discount rate		1.90%	1.20%
FRANCE | Present value of defined benefit obligation
Disclosure of defined benefit plans [Line Items]
Settlements	€ 247	$ 294

X

- 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

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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

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- Definition

The fair value of the entity's own transferable financial instruments that are included in the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Financial instruments, class [member]; Defined benefit plans [member]]

+ References

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The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]]

+ References

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The decrease (increase) in the net defined benefit liability (asset) resulting from settlements. Settlements are transactions that eliminate all further legal or constructive obligations for part or all of the benefits provided under a defined benefit plan, other than a payment of benefits to, or on behalf of, employees that is set out in the terms of the plan and included in the actuarial assumptions. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]; Actuarial assumptions [member]]

+ References

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The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

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The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]]

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Defined benefit expenses exlcuded from underlying earnings.

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No definition available.

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Defined benefit obligation weighted average expected future life After Balance Sheet Date

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Defined benefit obligation weighted average expected future life time at balance sheet date.

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Excess of service cost over cash paid to defined contribution plans

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