v3.26.1
Segmental analysis - Profit from operations by segment (Details) - GBP (£)
£ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Disclosure Of Operating Segments [Line Items]      
Profit from operations £ 4,266 £ 5,069  
Net finance costs (403) (969)  
Associates and joint ventures 189 1,474  
Profit before taxation 4,052 5,574  
Taxation (824) (1,009)  
Profit for the period 3,228 4,565  
Canada      
Disclosure Of Operating Segments [Line Items]      
Net finance costs £ (54) (59)  
Percentage of net income after taxes used for adjustment 85.00%   100.00%
Reported      
Disclosure Of Operating Segments [Line Items]      
Profit from operations £ 4,266 5,069  
Adj items      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 1,160 325  
Adjusted      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 5,426 5,394  
Exchange      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 104    
Adjusted at CC      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 5,530    
Net finance costs (806) (871)  
Associates and joint ventures   211  
Canada at CC      
Disclosure Of Operating Segments [Line Items]      
Profit from operations (109)    
As adj. for Canada at CC      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 5,421    
Adj for Canada3      
Disclosure Of Operating Segments [Line Items]      
Profit from operations   (154)  
As adjusted for Canada      
Disclosure Of Operating Segments [Line Items]      
Profit from operations   5,240  
U.S. | Reported      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 2,595 2,255  
U.S. | Adj items      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 652 808  
U.S. | Adjusted      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 3,247 3,063  
U.S. | Exchange      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 124    
U.S. | Adjusted at CC      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 3,371    
U.S. | Canada at CC      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 0    
U.S. | As adj. for Canada at CC      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 3,371    
U.S. | Adj for Canada3      
Disclosure Of Operating Segments [Line Items]      
Profit from operations   0  
U.S. | As adjusted for Canada      
Disclosure Of Operating Segments [Line Items]      
Profit from operations   3,063  
AME | Reported      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 1,212 1,969  
AME | Adj items      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 259 (495)  
AME | Adjusted      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 1,471 1,474  
AME | Exchange      
Disclosure Of Operating Segments [Line Items]      
Profit from operations (28)    
AME | Adjusted at CC      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 1,443    
AME | Canada at CC      
Disclosure Of Operating Segments [Line Items]      
Profit from operations (109)    
AME | As adj. for Canada at CC      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 1,334    
AME | Adj for Canada3      
Disclosure Of Operating Segments [Line Items]      
Profit from operations   (154)  
AME | As adjusted for Canada      
Disclosure Of Operating Segments [Line Items]      
Profit from operations   1,320  
APMEA | Reported      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 459 845  
APMEA | Adj items      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 249 12  
APMEA | Adjusted      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 708 857  
APMEA | Exchange      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 8    
APMEA | Adjusted at CC      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 716    
APMEA | Canada at CC      
Disclosure Of Operating Segments [Line Items]      
Profit from operations 0    
APMEA | As adj. for Canada at CC      
Disclosure Of Operating Segments [Line Items]      
Profit from operations £ 716    
APMEA | Adj for Canada3      
Disclosure Of Operating Segments [Line Items]      
Profit from operations   0  
APMEA | As adjusted for Canada      
Disclosure Of Operating Segments [Line Items]      
Profit from operations   £ 857