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Financial risk management objectives and policies - Financial instruments at Fair Value (Details) - GBP (£)
£ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents £ 2,638 £ 2,218 £ 2,492
Other investments 398 333 £ 370
Derivative liabilities (52) 31  
Contingent consideration liabilities (133) (199)  
Derivatives in designated hedge relationships | At Fair Value | Derivative liabilities      
Disclosure of detailed information about financial instruments [line items]      
Derivative liabilities (55) 0  
Derivatives in designated hedge relationships | Level 1 | At Fair Value | Derivative liabilities      
Disclosure of detailed information about financial instruments [line items]      
Derivative liabilities 0 0  
Derivatives in designated hedge relationships | Level 2 | At Fair Value | Derivative liabilities      
Disclosure of detailed information about financial instruments [line items]      
Derivative liabilities (55) 0  
Derivatives in designated hedge relationships | Level 3 | At Fair Value | Derivative liabilities      
Disclosure of detailed information about financial instruments [line items]      
Derivative liabilities 0 0  
Held at fair value through profit or loss | At Fair Value | Derivative liabilities      
Disclosure of detailed information about financial instruments [line items]      
Derivative liabilities (2) (2)  
Held at fair value through profit or loss | At Fair Value | Contingent consideration liabilities      
Disclosure of detailed information about financial instruments [line items]      
Contingent consideration liabilities (133) (199)  
Held at fair value through profit or loss | Level 1 | At Fair Value | Derivative liabilities      
Disclosure of detailed information about financial instruments [line items]      
Derivative liabilities 0 0  
Held at fair value through profit or loss | Level 1 | At Fair Value | Contingent consideration liabilities      
Disclosure of detailed information about financial instruments [line items]      
Contingent consideration liabilities 0 0  
Held at fair value through profit or loss | Level 2 | At Fair Value | Derivative liabilities      
Disclosure of detailed information about financial instruments [line items]      
Derivative liabilities (2) (2)  
Held at fair value through profit or loss | Level 2 | At Fair Value | Contingent consideration liabilities      
Disclosure of detailed information about financial instruments [line items]      
Contingent consideration liabilities 0 0  
Held at fair value through profit or loss | Level 3 | At Fair Value | Derivative liabilities      
Disclosure of detailed information about financial instruments [line items]      
Derivative liabilities 0 0  
Held at fair value through profit or loss | Level 3 | At Fair Value | Contingent consideration liabilities      
Disclosure of detailed information about financial instruments [line items]      
Contingent consideration liabilities (133) (199)  
Money market funds | Held at fair value through profit or loss | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents 655 181  
Money market funds | Held at fair value through profit or loss | Level 1 | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents 655 181  
Money market funds | Held at fair value through profit or loss | Level 2 | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents 0 0  
Money market funds | Held at fair value through profit or loss | Level 3 | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents 0 0  
Other investments | Held at fair value through profit or loss | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Other investments 306 258  
Other investments | Held at fair value through profit or loss | Level 1 | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Other investments 73 1  
Other investments | Held at fair value through profit or loss | Level 2 | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Other investments 0 0  
Other investments | Held at fair value through profit or loss | Level 3 | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Other investments 233 257  
Other investments | Other investments | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Other investments 92 75  
Other investments | Other investments | Level 1 | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Other investments 3 7  
Other investments | Other investments | Level 2 | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Other investments 0 0  
Other investments | Other investments | Level 3 | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Other investments 89 68  
Derivative assets | Derivatives in designated hedge relationships | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets 4 31  
Derivative assets | Derivatives in designated hedge relationships | Level 1 | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets 0 0  
Derivative assets | Derivatives in designated hedge relationships | Level 2 | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets 4 31  
Derivative assets | Derivatives in designated hedge relationships | Level 3 | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets 0 0  
Derivative assets | Held at fair value through profit or loss | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets 1 2  
Derivative assets | Held at fair value through profit or loss | Level 1 | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets 0 0  
Derivative assets | Held at fair value through profit or loss | Level 2 | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets 1 2  
Derivative assets | Held at fair value through profit or loss | Level 3 | At Fair Value      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets £ 0 £ 0