v3.26.1
Interests in associates and joint ventures - Key assumptions in value in use calculation (Details) - USD ($)
$ in Billions
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Bank of Communications Co., Limited    
Disclosure of associates [line items]    
Long-term profit growth rate 3.00% 3.00%
Long-term asset growth rate 3.25% 3.25%
Discount rate 7.83% 8.08%
Expected credit losses as a percentage of customer advances in the long term 0.83% 0.87%
Risk-weighted assets as a percentage of total assets in the long term 63.00% 62.00%
Effective tax rate in the long-term 15.00% 15.00%
Capital adequacy ratio 12.50% 12.50%
Tier 1 capital adequacy ratio 9.50% 9.50%
Proportion of ownership interest in associate 16.00%  
Bank of Communications Co., Limited | Discount rate    
Disclosure of associates [line items]    
Change in bps due to reasonably possible favourable changes in key assumptions 0.50%  
Bank of Communications Co., Limited | Minimum    
Disclosure of associates [line items]    
Discount rate 7.10% 7.10%
Expected credit losses as a percentage of customer advances in the short to medium term 0.65% 0.67%
Risk-weighted assets as a percentage of total assets in the short to medium term 63.00% 62.00%
Loans and advances to customer growth rate 7.00% 7.50%
Operating income ratio 2.80% 0.50%
Cost-income ratio 36.50% 34.80%
Recoverable amount of asset or cash-generating unit $ 14.8 $ 13.4
Fair value over five years $ 7.5  
Bank of Communications Co., Limited | Maximum    
Disclosure of associates [line items]    
Discount rate 8.80% 8.70%
Expected credit losses as a percentage of customer advances in the short to medium term 0.77% 0.87%
Risk-weighted assets as a percentage of total assets in the short to medium term   64.20%
Loans and advances to customer growth rate 7.50% 8.00%
Operating income ratio 7.00% 7.40%
Cost-income ratio 39.30% 40.00%
Recoverable amount of asset or cash-generating unit $ 32.6 $ 31.0
Fair value over five years $ 13.1  
Saudi Awwal Bank    
Disclosure of associates [line items]    
Proportion of ownership interest in associate 31.00%