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Goodwill and other intangible assets - Summary of Terminal Growth Rates and Discount Rates Used in Impairment Tests (Details)
Dec. 31, 2025
Dec. 31, 2024
Americas    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Terminal growth rate 2.00% 2.10%
Pre-tax discount rate 12.00% 11.60%
EMEAA    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Terminal growth rate 2.30% 2.50%
Pre-tax discount rate 12.90% 13.60%
Greater China    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Terminal growth rate 2.50% 2.50%
Pre-tax discount rate 9.90% 10.50%