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Employees - Summary of Assumptions, Weighted by Liabilities for Valuation of Defined Benefit Plans in the UK and the Netherlands (Details)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
United Kingdom    
Disclosure of defined benefit plans [line items]    
Discount rate 5.00% 1.90%
Inflation 3.10% 3.20%
Rate of increase in salaries 3.60% 3.70%
Number of years a current pensioner is expected to live beyond age 65 - Men (in years) 21 years 9 months 18 days 21 years 9 months 18 days
Number of years a current pensioner is expected to live beyond age 65 - Women (in years) 23 years 7 months 6 days 23 years 7 months 6 days
Number of years a future pensioner currently aged 45 is expected to live beyond age 65 - Men (in years) 22 years 10 months 24 days 22 years 9 months 18 days
Number of years a future pensioner currently aged 45 is expected to live beyond age 65 - Women (in years) 24 years 9 months 18 days 24 years 9 months 18 days
United Kingdom | Pensions in payment    
Disclosure of defined benefit plans [line items]    
Rate of increase for pensions in payment (where provided) 2.90% 3.10%
United Kingdom | Pensions in deferment    
Disclosure of defined benefit plans [line items]    
Rate of increase for pensions in deferment (where provided) 2.90% 3.10%
The Netherlands    
Disclosure of defined benefit plans [line items]    
Discount rate 3.70% 1.10%
Inflation 2.20% 1.90%
Rate of increase in salaries 2.70% 2.40%
Number of years a current pensioner is expected to live beyond age 65 - Men (in years) 21 years 9 months 18 days 21 years 7 months 6 days
Number of years a current pensioner is expected to live beyond age 65 - Women (in years) 24 years 23 years 8 months 12 days
Number of years a future pensioner currently aged 45 is expected to live beyond age 65 - Men (in years) 23 years 9 months 18 days 23 years 6 months
Number of years a future pensioner currently aged 45 is expected to live beyond age 65 - Women (in years) 26 years 25 years 6 months
The Netherlands | Pensions in payment    
Disclosure of defined benefit plans [line items]    
Rate of increase for pensions in payment (where provided) 2.20% 1.90%
The Netherlands | Pensions in deferment    
Disclosure of defined benefit plans [line items]    
Rate of increase for pensions in deferment (where provided) 2.20% 1.90%