v3.25.2
Contingent liabilities and financial commitments - additional information (Details)
£ in Millions, $ in Millions, $ in Millions
 6 Months Ended 24 Months Ended 30 Months Ended
Feb. 10, 2023
Dec. 11, 2019
GBP (£)
Dec. 11, 2019
USD ($)
Mar. 08, 2019
CAD ($)
Mar. 08, 2019
GBP (£)
Jan. 31, 2019
CAD ($)
Jan. 31, 2019
GBP (£)
Jun. 30, 2025
CAD ($)
province
Case
Plaintiff
ACTION
Jun. 30, 2025
GBP (£)
Case
Plaintiff
ACTION
Jun. 30, 2025
USD ($)
Case
Plaintiff
ACTION
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
GBP (£)
Jun. 30, 2025
GBP (£)
Jun. 30, 2025
USD ($)
Oct. 17, 2024
CAD ($)
Oct. 17, 2024
GBP (£)
Sep. 14, 2024
Case
Mar. 01, 2019
CAD ($)
Mar. 01, 2019
GBP (£)
Disclosure Of Commitments And Contingencies [Line Items]                                      
Canada provinces | province               10                      
Canada provinces for which damages are quantified | province               5                      
Cash retained for working capital needs | $                             $ 750        
Kalamazoo river                                      
Disclosure Of Commitments And Contingencies [Line Items]                                      
Payments on remediation work   £ 178.8 $ 245.0                                
Kalamazoo river | N C R                                      
Disclosure Of Commitments And Contingencies [Line Items]                                      
Recovery percentage 60.00%                                    
Number of affirmative defences, striking                                 1    
Number of affirmative defences                                 8    
Number of counterclaims, dismissed                                 3    
Number of counterclaims                                 5    
Kalamazoo river | Georgia Pacific | N C R                                      
Disclosure Of Commitments And Contingencies [Line Items]                                      
Payment of outstanding judgment   £ 14.6 $ 20.0                                
Settlement of tobacco litigation in Canada                                      
Disclosure Of Commitments And Contingencies [Line Items]                                      
Other provisions               $ 32,500             $ 32,500 £ 17,400.0      
Settlement of tobacco litigation in Canada, upfront payment                                      
Disclosure Of Commitments And Contingencies [Line Items]                                      
Percentage of cash tax refunds received from upfront payments                             85.00% 85.00%      
Annual payments, percentage of net income after taxes                             85.00% 85.00%      
Engle Progeny cases | Compensatory damages awarded                                      
Disclosure Of Commitments And Contingencies [Line Items]                                      
Litigation expense included in other operating expense                         £ 23.7 $ 32.5          
Engle Progeny cases | Punitive damages awarded                                      
Disclosure Of Commitments And Contingencies [Line Items]                                      
Litigation expense included in other operating expense                         £ 18.8 $ 25.7          
Canada                                      
Disclosure Of Commitments And Contingencies [Line Items]                                      
Number of actions in lawsuit | ACTION               10 10 10                  
Canada | Imperial Tobacco Canada Ltd | Quebec class actions                                      
Disclosure Of Commitments And Contingencies [Line Items]                                      
Settlement payments       $ 758 £ 405.0                            
Canada | Bottom of range                                      
Disclosure Of Commitments And Contingencies [Line Items]                                      
Damages sought               $ 10,000 £ 5,300.0                    
Canada | Top of range                                      
Disclosure Of Commitments And Contingencies [Line Items]                                      
Damages sought               118,000 63,100.0                    
Canada | Top of range | Imperial Tobacco Canada Ltd                                      
Disclosure Of Commitments And Contingencies [Line Items]                                      
Settlement proceeds from judgement                                   $ 9,200 £ 4,900.0
Ontario                                      
Disclosure Of Commitments And Contingencies [Line Items]                                      
Damages sought               $ 330,000 £ 176,500.0                    
Ontario | Bottom of range                                      
Disclosure Of Commitments And Contingencies [Line Items]                                      
Damages sought           $ 9,400 £ 5,000.0       $ 280,000 £ 149,700.0              
Ontario | Top of range                                      
Disclosure Of Commitments And Contingencies [Line Items]                                      
Damages sought           $ 10,900 £ 5,800.0       $ 630,000 £ 336,900.0              
US - Engle | Engle Progeny cases                                      
Disclosure Of Commitments And Contingencies [Line Items]                                      
Total number of cases               76                      
Number of plaintiffs | Plaintiff               96 96 96                  
US - Engle | RJRT or Lorillard Inc                                      
Disclosure Of Commitments And Contingencies [Line Items]                                      
Number of paid judgements cases               3 3 3                  
Payment for compensatory and punitive damages                 £ 4.6 $ 6.3                  
Florida | Engle Progeny cases                                      
Disclosure Of Commitments And Contingencies [Line Items]                                      
Total bond cap                 £ 145.9 $ 200.0