Retirement Benefit Obligations - Summary of Average Duration and Scheme Composition (Detail)	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Eurozone
Disclosure of defined benefit plans [Line Items]
Average duration of defined benefit obligation (years)	14 years	18 years 3 months 18 days	18 years 3 months 18 days
Active plan participants	70.00%	69.00%	70.00%
Deferred plan participants	10.00%	10.00%	10.00%
Retirees	20.00%	21.00%	20.00%
United States and Canada
Disclosure of defined benefit plans [Line Items]
Average duration of defined benefit obligation (years)	10 years 2 months 12 days	12 years 3 months 18 days	12 years 10 months 24 days
Active plan participants	47.00%	49.00%	43.00%
Deferred plan participants	15.00%	15.00%	12.00%
Retirees	38.00%	36.00%	45.00%
Switzerland
Disclosure of defined benefit plans [Line Items]
Average duration of defined benefit obligation (years)	13 years 6 months	17 years	17 years 7 months 6 days
Active plan participants	76.00%	74.00%	74.00%
Deferred plan participants	0.00%	0.00%	0.00%
Retirees	24.00%	26.00%	26.00%

Allocation of defined benefit obligation by active plan participant.

No definition available.

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- Definition

Allocation of defined benefit obligation by deferred plan participant.

+ References

No definition available.

+ Details

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- Definition

Allocation of defined benefit obligation by retirees.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

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- Definition

The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2022-03-24
-Paragraph 147
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_147_c&doctype=Standard
-URIDate 2022-03-24

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