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Associates and Joint Ventures - Additional Information (Details) - GBP (£)
£ in Millions
1 Months Ended 12 Months Ended
Dec. 06, 2024
Mar. 13, 2024
Aug. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of transactions between related parties [line items]              
Foreign exchange reclassified reclassified to income statement       £ 43 £ 0 £ 0  
ITC Ltd.              
Disclosure of transactions between related parties [line items]              
Ownership interest in associates       25.45% 29.02% 29.19% 29.38%
Gains (losses) on disposals of investments       £ (18) £ (40) £ 3  
Number of shares held disposed (in shares)   436,851,457          
Proportion of ownership interest in associate disposed (in percentage)   12.00%          
Percentage of voting equity interest disposed (in percentage)   3.50%          
Gains on disposals of investments   £ 1,361          
Foreign exchange reclassified reclassified to income statement   £ 43          
Share of loss of associates         £ 2    
Organigram Inc.              
Disclosure of transactions between related parties [line items]              
Ownership interest in associates 30.60%   35.09% 35.09% 18.79%    
Amortisation of acquired intangibles           2  
Impairment loss, net of tax         £ 34 59  
Provided in the year         £ 36    
Kamaran Industry & Investment Company              
Disclosure of transactions between related parties [line items]              
Provided in the year           £ 18