v3.25.2
Results of associates and joint ventures (Details)
$ / shares in Units, £ in Millions, $ in Millions, $ in Millions
1 Months Ended 5 Months Ended 6 Months Ended 12 Months Ended
May 28, 2025
shares
Feb. 28, 2025
GBP (£)
shares
Feb. 28, 2025
CAD ($)
$ / shares
shares
Jan. 01, 2025
Dec. 06, 2024
GBP (£)
Dec. 06, 2024
USD ($)
Dec. 05, 2024
Mar. 13, 2024
GBP (£)
shares
Jun. 30, 2025
May 28, 2025
Jun. 30, 2025
GBP (£)
Jun. 30, 2024
GBP (£)
Dec. 31, 2024
Disclosure of associates [abstract]                          
Share of post-tax results of associates and joint ventures                     £ 1,474 £ 1,647  
ITC Hotels Limited                          
Disclosure of associates [abstract]                          
Percentage interest in investments                     15.00%    
Reported at CC                          
Disclosure of associates [abstract]                          
Share of post-tax results of associates and joint ventures                     £ 245    
Decrease in share of profit (loss) of associates and joint ventures                     (12.70%)    
ITC Hotels Limited                          
Disclosure of associates [abstract]                          
Equity allocated to shareholders       60.00%                  
Motif Labs Ltd | Organigram Inc                          
Disclosure of associates [abstract]                          
Consideration paid (received) | $           $ 40              
ITC Ltd.                          
Disclosure of associates [abstract]                          
Gains (losses) on disposals of investments                     £ 3    
Ownership interest in associates                 22.93% 25.43%     25.45%
Number of shares of associate disposed of (in shares) | shares 313,000,000             436,851,457          
Adjustments for gain on disposal of investments in subsidiaries, joint ventures and associates               £ 1,361     £ 904 £ 1,361  
Percentage of voting equity interests disposed of               3.50%     2.50%    
Percentage of ownership interests in associate disposed of               12.00%          
ITC Ltd. | ITC Hotels Limited                          
Disclosure of associates [abstract]                          
Share of profit (loss) of associates relating to gain on demerger                     £ 333    
Organigram Inc                          
Disclosure of associates [abstract]                          
Gains (losses) on disposals of investments         £ (1)                
Ownership interest in associates   36.70% 36.70%   30.60% 30.60% 35.09%            
Purchase of interests in investments accounted for using equity method   £ 23 $ 42                    
Price per share (in CAD per share) | $ / shares     $ 3.22                    
Organigram Inc | Ordinary shares                          
Disclosure of associates [abstract]                          
Number of shares acquired (in shares) | shares   7,562,447 7,562,447                    
Organigram Inc | Preference shares                          
Disclosure of associates [abstract]                          
Number of shares acquired (in shares) | shares   5,330,728 5,330,728                    
VST Industries Limited                          
Disclosure of associates [abstract]                          
Gains on disposals of property, plant and equipment                     £ 3