v3.26.1
Contingent liabilities and financial commitments - additional information (Details)
$ in Billions
 6 Months Ended 12 Months Ended 30 Months Ended
May 11, 2026
Feb. 10, 2023
Dec. 11, 2019
GBP (£)
Dec. 11, 2019
USD ($)
Dec. 31, 2026
Jun. 30, 2026
GBP (£)
Plaintiff
Case
Jun. 30, 2026
USD ($)
Plaintiff
Case
Dec. 31, 2025
Jun. 30, 2026
GBP (£)
Case
Jun. 30, 2026
USD ($)
Case
Jul. 01, 2026
GBP (£)
Oct. 17, 2024
GBP (£)
Oct. 17, 2024
CAD ($)
Sep. 14, 2024
Case
Disclosure Of Commitments And Contingencies [Line Items]                            
DPA term 3 years                          
Settlement of tobacco litigation in Canada                            
Disclosure Of Commitments And Contingencies [Line Items]                            
Proportion of upfront payment towards the settlement               85.00%            
Proportion of upfront payment towards the settlement reduced               70.00%            
Other provisions                       £ 17,300,000,000 $ 32.5  
Compensatory damages awarded | Engle Progeny Cases                            
Disclosure Of Commitments And Contingencies [Line Items]                            
Litigation expense included in other operating expense                 £ 14,500,000 $ 19,600,000        
Punitive damages awarded | Engle Progeny Cases                            
Disclosure Of Commitments And Contingencies [Line Items]                            
Litigation expense included in other operating expense                 £ 19,500,000 $ 26,400,000        
Kalamazoo river                            
Disclosure Of Commitments And Contingencies [Line Items]                            
Payments on remediation work     £ 181,300,000 $ 245,000,000                    
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     £ 14,800,000 $ 20,000,000                    
Netherlands | Entering into significant commitments or contingent liabilities [member] | Tax contingent liability                            
Disclosure Of Commitments And Contingencies [Line Items]                            
Estimated financial effect of contingent liabilities | £                     £ 105,000,000      
Bank guarantee period         5 years                  
Netherlands | Entering into significant commitments or contingent liabilities [member] | Top of range | Tax contingent liability                            
Disclosure Of Commitments And Contingencies [Line Items]                            
Estimated financial effect of contingent liabilities | £                     £ 488,000,000      
US - Engle | Engle Progeny Cases                            
Disclosure Of Commitments And Contingencies [Line Items]                            
Total number of cases           21 21   21 21        
Number of plaintiffs | Plaintiff           31 31              
US - Engle | RJRT or Lorillard Inc                            
Disclosure Of Commitments And Contingencies [Line Items]                            
Number of paid judgements cases           1 1              
Payment for compensatory and punitive damages           £ 499,537 $ 675,000              
Florida | Engle Progeny Cases                            
Disclosure Of Commitments And Contingencies [Line Items]                            
Total bond cap                 £ 148,000,000.0 $ 200,000,000