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Employee benefit obligations - Funded and Unfunded Pension Plans By Region (Details) - GBP (£)
£ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of defined benefit plans [line items]    
Surplus (deficit) £ (114) £ (122)
Defined benefit obligation, at present value (365) (381)
United Kingdom    
Disclosure of defined benefit plans [line items]    
Surplus (deficit) 1 1
North America    
Disclosure of defined benefit plans [line items]    
Surplus (deficit) (23) (30)
Western Continental Europe    
Disclosure of defined benefit plans [line items]    
Surplus (deficit) (56) (60)
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe    
Disclosure of defined benefit plans [line items]    
Surplus (deficit) (36) (33)
Funded plans by region    
Disclosure of defined benefit plans [line items]    
Surplus (deficit) (20) (31)
Defined benefit obligation, at present value (271) (290)
Funded plans by region | United Kingdom    
Disclosure of defined benefit plans [line items]    
Surplus (deficit) 1 1
Defined benefit obligation, at present value (9) (9)
Funded plans by region | North America    
Disclosure of defined benefit plans [line items]    
Surplus (deficit) 11 7
Defined benefit obligation, at present value (174) (183)
Funded plans by region | Western Continental Europe    
Disclosure of defined benefit plans [line items]    
Surplus (deficit) (29) (34)
Defined benefit obligation, at present value (65) (70)
Funded plans by region | Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe    
Disclosure of defined benefit plans [line items]    
Surplus (deficit) (3) (5)
Defined benefit obligation, at present value (23) (28)
Unfunded plans by region    
Disclosure of defined benefit plans [line items]    
Surplus (deficit) (94) (91)
Defined benefit obligation, at present value (94) (91)
Unfunded plans by region | North America    
Disclosure of defined benefit plans [line items]    
Surplus (deficit) (34) (37)
Defined benefit obligation, at present value (34) (37)
Unfunded plans by region | Western Continental Europe    
Disclosure of defined benefit plans [line items]    
Surplus (deficit) (27) (26)
Defined benefit obligation, at present value (27) (26)
Unfunded plans by region | Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe    
Disclosure of defined benefit plans [line items]    
Surplus (deficit) (33) (28)
Defined benefit obligation, at present value £ (33) £ (28)