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Measurement of financial assets and liabilities - Level 3 financial instruments (Details) - At fair value - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of movements in level 3 assets measured at fair value    
Transfers into level 3 $ 0  
Loans    
Reconciliation of movements in level 3 assets measured at fair value    
Assets at beginning of year 430  
Assets at end of year 364 $ 430
Equity securities and portfolio holdings in collective investment schemes    
Reconciliation of movements in level 3 assets measured at fair value    
Assets at beginning of year 64,753  
Assets at end of year 81,002 64,753
Debt securities    
Reconciliation of movements in level 3 assets measured at fair value    
Assets at beginning of year 83,064  
Assets at end of year 73,804 83,064
Level 3    
Reconciliation of movements in level 3 assets measured at fair value    
Assets at beginning of year 2,904 865
Total gain (loss) in income statement (81) 27
Total (losses) gains recorded in other comprehensive income (32) 6
Purchases and other additions 464 524
Sales (101) (7)
Transfers into level 3   1,489
Assets at end of year 3,154 2,904
Net unrealised (loss) gains on financial instruments held at the end of the year (143) 29
Level 3 | Loans    
Reconciliation of movements in level 3 assets measured at fair value    
Assets at beginning of year   3
Sales   (3)
Level 3 | Equity securities and portfolio holdings in collective investment schemes    
Reconciliation of movements in level 3 assets measured at fair value    
Assets at beginning of year 2,864 824
Total gain (loss) in income statement (84) 25
Total (losses) gains recorded in other comprehensive income (31) 6
Purchases and other additions 462 524
Sales (94) (4)
Transfers into level 3   1,489
Assets at end of year 3,117 2,864
Net unrealised (loss) gains on financial instruments held at the end of the year (146) 27
Level 3 | Debt securities    
Reconciliation of movements in level 3 assets measured at fair value    
Assets at beginning of year 40 38
Total gain (loss) in income statement 3 2
Total (losses) gains recorded in other comprehensive income (1)  
Purchases and other additions 2  
Sales (7)  
Assets at end of year 37 40
Net unrealised (loss) gains on financial instruments held at the end of the year $ 3 $ 2