v3.25.4
Interest in associates and joint ventures - Sensitivity of VIU (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Expected credit losses as a percentage of loans and advances to customers | Minimum    
Disclosure of associates [line items]    
Change in bps due to reasonably possible favourable changes in key assumptions 0.64% 0.66%
Change in bps due to reasonably possible unfavourable changes in key assumptions 0.90% 1.08%
Expected credit losses as a percentage of loans and advances to customers | Maximum    
Disclosure of associates [line items]    
Change in bps due to reasonably possible favourable changes in key assumptions 0.84% 0.91%
Change in bps due to reasonably possible unfavourable changes in key assumptions 0.98% 1.04%
Bank Of Communications Co., Limited    
Disclosure of associates [line items]    
Fair value $ 11,713 $ 11,631
Change in discount rate from prior year 0.50%  
Bank Of Communications Co., Limited | Minimum    
Disclosure of associates [line items]    
Value in use of investments in associates after reasonably possible changes in key assumptions $ 13,400 13,500
Fair value 7,500  
Bank Of Communications Co., Limited | Maximum    
Disclosure of associates [line items]    
Value in use of investments in associates after reasonably possible changes in key assumptions 31,000 $ 30,800
Fair value $ 13,100  
Bank Of Communications Co., Limited | Long-term profit growth rate    
Disclosure of associates [line items]    
Change in bps due to reasonably possible favourable changes in key assumptions 0.30% 0.55%
Change in VIU due to reasonably possible favourable changes in key assumptions $ 2,100 $ 4,000
Change in bps due to reasonably possible unfavourable changes in key assumptions (1.04%) (0.96%)
Change in VIU due to reasonably possible unfavourable changes in key assumptions $ (6,000) $ (5,400)
Bank Of Communications Co., Limited | Long-term asset growth rate    
Disclosure of associates [line items]    
Change in bps due to reasonably possible favourable changes in key assumptions (1.29%) (1.21%)
Change in VIU due to reasonably possible favourable changes in key assumptions $ 9,100 $ 8,600
Change in bps due to reasonably possible unfavourable changes in key assumptions 0.05% 0.30%
Change in VIU due to reasonably possible unfavourable changes in key assumptions $ (500) $ (2,800)
Bank Of Communications Co., Limited | Discount rate    
Disclosure of associates [line items]    
Change in bps due to reasonably possible favourable changes in key assumptions (0.98%) (1.43%)
Change in VIU due to reasonably possible favourable changes in key assumptions $ 4,600 $ 5,400
Change in bps due to reasonably possible unfavourable changes in key assumptions 2.32% 2.87%
Change in VIU due to reasonably possible unfavourable changes in key assumptions $ (5,500) $ (6,400)
Bank Of Communications Co., Limited | Expected credit losses as a percentage of loans and advances to customers    
Disclosure of associates [line items]    
Change in VIU due to reasonably possible favourable changes in key assumptions 1,800 4,000
Change in VIU due to reasonably possible unfavourable changes in key assumptions $ (4,700) $ (4,300)
Bank Of Communications Co., Limited | Risk-weighted assets as a percentage of total assets    
Disclosure of associates [line items]    
Change in bps due to reasonably possible favourable changes in key assumptions (1.84%) (1.32%)
Change in VIU due to reasonably possible favourable changes in key assumptions $ 800 $ 800
Change in bps due to reasonably possible unfavourable changes in key assumptions 1.82% 2.34%
Change in VIU due to reasonably possible unfavourable changes in key assumptions $ (1,700) $ (1,700)
Bank Of Communications Co., Limited | Loans and advances to customers growth rate    
Disclosure of associates [line items]    
Change in bps due to reasonably possible favourable changes in key assumptions (1.38%) 0.76%
Change in VIU due to reasonably possible favourable changes in key assumptions $ 1,800  
Change in bps due to reasonably possible unfavourable changes in key assumptions 4.55%  
Change in VIU due to reasonably possible unfavourable changes in key assumptions $ (7,100) $ (3,300)
Bank Of Communications Co., Limited | Operating income growth rate    
Disclosure of associates [line items]    
Change in bps due to reasonably possible favourable changes in key assumptions 1.01% 0.76%
Change in VIU due to reasonably possible favourable changes in key assumptions $ 3,700 $ 2,700
Change in bps due to reasonably possible unfavourable changes in key assumptions (1.00%) (0.81%)
Change in VIU due to reasonably possible unfavourable changes in key assumptions $ (3,800) $ (3,300)
Bank Of Communications Co., Limited | Cost-income ratio    
Disclosure of associates [line items]    
Change in bps due to reasonably possible favourable changes in key assumptions (2.81%) (1.90%)
Change in VIU due to reasonably possible favourable changes in key assumptions $ 400 $ 200
Change in bps due to reasonably possible unfavourable changes in key assumptions 2.92% 3.80%
Change in VIU due to reasonably possible unfavourable changes in key assumptions $ (6,400) $ (7,100)
Bank Of Communications Co., Limited | Long-term effective tax rate    
Disclosure of associates [line items]    
Change in bps due to reasonably possible favourable changes in key assumptions (4.26%) (4.26%)
Change in VIU due to reasonably possible favourable changes in key assumptions $ 1,700 $ 1,600
Change in bps due to reasonably possible unfavourable changes in key assumptions 10.00% 10.00%
Change in VIU due to reasonably possible unfavourable changes in key assumptions $ (4,000) $ (4,000)
Bank Of Communications Co., Limited | Capital requirements – capital adequacy ratio    
Disclosure of associates [line items]    
Change in bps due to reasonably possible favourable changes in key assumptions 0.00% 0.00%
Change in VIU due to reasonably possible favourable changes in key assumptions $ 0 $ 0
Change in bps due to reasonably possible unfavourable changes in key assumptions 3.63% 3.72%
Change in VIU due to reasonably possible unfavourable changes in key assumptions $ (13,000) $ (14,300)
Bank Of Communications Co., Limited | Capital requirements – tier 1 capital adequacy ratio    
Disclosure of associates [line items]    
Change in bps due to reasonably possible favourable changes in key assumptions 0.00% 0.00%
Change in VIU due to reasonably possible favourable changes in key assumptions $ 0 $ 0
Change in bps due to reasonably possible unfavourable changes in key assumptions 3.33% 2.70%
Change in VIU due to reasonably possible unfavourable changes in key assumptions $ (6,900) $ (6,700)
Bank Of Communications Co., Limited | Loans and advances to customers growth rate    
Disclosure of associates [line items]    
Change in bps due to reasonably possible favourable changes in key assumptions   (2.17%)
Change in VIU due to reasonably possible favourable changes in key assumptions   $ 3,400
Change in bps due to reasonably possible unfavourable changes in key assumptions   3.40%
Change in VIU due to reasonably possible unfavourable changes in key assumptions   $ (6,100)