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FINANCIAL RISK MANAGEMENT OBJECTIVES AND POLICIES - Analysis of Financial Instruments Measured at Fair Value (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Contingent consideration liabilities    
Beginning balance £ (18,682)  
Ending balance (18,351) £ (18,682)
At Fair Value | Contingent consideration liabilities | Level 3    
Contingent consideration liabilities    
Beginning balance (133) (199)
Gains/(losses) recognised in the income statement 1 1
Losses recognised in other comprehensive income 0  
Exchange adjustments (1) (1)
Transfers 27  
Additions 0 (33)
Settlements 65 97
Ending balance (39) (133)
At Fair Value | Other investments | Other investments | Level 3    
Other investments    
Beginning balance 322 325
Gains/(losses) recognised in the income statement (21) (29)
Losses recognised in other comprehensive income (54)  
Exchange adjustments 15 (2)
Transfers (6)  
Additions 9 24
Settlements 0 0
Ending balance £ 235 £ 322