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Financial Instruments - fair value - Fair Value of Assets and Liabilities (Details) - GBP (£)
£ in Millions
Jun. 30, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Cash and cash equivalents £ 1,437 £ 2,638
Other investments 346 £ 398
Derivatives in designated hedge relationships | At Fair Value | Derivative liabilities    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial liabilities (3)  
Derivatives in designated hedge relationships | Level 1 | At Fair Value | Derivative liabilities    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial liabilities 0  
Derivatives in designated hedge relationships | Level 2 | At Fair Value | Derivative liabilities    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial liabilities (3)  
Derivatives in designated hedge relationships | Level 3 | At Fair Value | Derivative liabilities    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial liabilities 0  
Held at fair value through profit or loss | Contingent consideration liabilities    
Disclosure of detailed information about financial instruments [line items]    
Contingent consideration liabilities (119)  
Held at fair value through profit or loss | At Fair Value | Derivative liabilities    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial liabilities (2)  
Held at fair value through profit or loss | Level 1 | Contingent consideration liabilities    
Disclosure of detailed information about financial instruments [line items]    
Contingent consideration liabilities 0  
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 financial liabilities 0  
Held at fair value through profit or loss | Level 2 | Contingent consideration liabilities    
Disclosure of detailed information about financial instruments [line items]    
Contingent consideration liabilities (31)  
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 financial liabilities (2)  
Held at fair value through profit or loss | Level 3 | Contingent consideration liabilities    
Disclosure of detailed information about financial instruments [line items]    
Contingent consideration liabilities (88)  
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 financial liabilities 0  
Derivative assets | Derivatives in designated hedge relationships | At Fair Value    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets 86  
Derivative assets | Derivatives in designated hedge relationships | Level 1 | At Fair Value    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets 0  
Derivative assets | Derivatives in designated hedge relationships | Level 2 | At Fair Value    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets 86  
Derivative assets | Derivatives in designated hedge relationships | Level 3 | At Fair Value    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets 0  
Derivative assets | Held at fair value through profit or loss | At Fair Value    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets 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 financial assets 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 financial assets 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 financial assets 0  
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 12  
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 12  
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  
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  
Trade and other receivables | Held at fair value through other comprehensive income | At Fair Value    
Disclosure of detailed information about financial instruments [line items]    
Trade and other receivables 237  
Trade and other receivables | Held at fair value through other comprehensive income | Level 1 | At Fair Value    
Disclosure of detailed information about financial instruments [line items]    
Trade and other receivables 0  
Trade and other receivables | Held at fair value through other comprehensive income | Level 2 | At Fair Value    
Disclosure of detailed information about financial instruments [line items]    
Trade and other receivables 237  
Trade and other receivables | Held at fair value through other comprehensive income | Level 3 | At Fair Value    
Disclosure of detailed information about financial instruments [line items]    
Trade and other receivables 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 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 60  
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  
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 198  
Other investments | Held at fair value through other comprehensive income | At Fair Value    
Disclosure of detailed information about financial instruments [line items]    
Other investments 88  
Other investments | Held at fair value through other comprehensive income | Level 1 | At Fair Value    
Disclosure of detailed information about financial instruments [line items]    
Other investments 2  
Other investments | Held at fair value through other comprehensive income | Level 2 | At Fair Value    
Disclosure of detailed information about financial instruments [line items]    
Other investments 0  
Other investments | Held at fair value through other comprehensive income | Level 3 | At Fair Value    
Disclosure of detailed information about financial instruments [line items]    
Other investments £ 86