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Retirement Benefit Obligations - Summary of Future Life Expectations Based on Retirement at 65 years of Age for Current and Future Retirees (Detail) - yr
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Republic of Ireland [member] | Current Retirees Male [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Future life expectations on retirement at 65 years of age 22.6 22.5 23.0
Republic of Ireland [member] | Current Retirees Female [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Future life expectations on retirement at 65 years of age 24.5 24.4 24.5
Republic of Ireland [member] | Future Retirees Male [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Future life expectations on retirement at 65 years of age 24.9 24.8 25.4
Republic of Ireland [member] | Future Retirees Female [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Future life expectations on retirement at 65 years of age 26.8 26.7 26.8
Switzerland [member] | Current Retirees Male [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Future life expectations on retirement at 65 years of age 22.6 22.6 22.6
Switzerland [member] | Current Retirees Female [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Future life expectations on retirement at 65 years of age 24.4 24.7 24.7
Switzerland [member] | Future Retirees Male [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Future life expectations on retirement at 65 years of age 25.4 24.8 24.8
Switzerland [member] | Future Retirees Female [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Future life expectations on retirement at 65 years of age 26.9 26.8 26.8
United States and Canada [member] | Current Retirees Male [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Future life expectations on retirement at 65 years of age 20.5 20.1 20.2
United States and Canada [member] | Current Retirees Female [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Future life expectations on retirement at 65 years of age 22.4 22.2 22.3
United States and Canada [member] | Future Retirees Male [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Future life expectations on retirement at 65 years of age 22.2 22.0 22.1
United States and Canada [member] | Future Retirees Female [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Future life expectations on retirement at 65 years of age 24.1 23.9 24.2