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Subsequent events (Details) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Dividend payables $ 2,295 $ 3,539
Interim Dividends [Member]    
IfrsStatementLineItems [Line Items]    
Date of approval Aug. 08, 2024  
Date of record Aug. 21, 2024  
Amount per common and preferred share $ 0.0258  
Dividend payables $ 333  
Interim Interest On Capital [Member]    
IfrsStatementLineItems [Line Items]    
Date of approval Aug. 08, 2024  
Date of record Aug. 21, 2024  
Amount per common and preferred share $ 0.0735  
Dividend payables $ 947  
Total Anticipated Dividends [Member]    
IfrsStatementLineItems [Line Items]    
Amount per common and preferred share $ 0.0993  
Dividend payables $ 1,280  
Profit Retention Reserve [Member]    
IfrsStatementLineItems [Line Items]    
Date of approval Aug. 08, 2024  
Date of record Aug. 21, 2024  
Amount per common and preferred share $ 0.0882  
Dividend payables $ 1,137  
Total Distribution To Shareholders [Member]    
IfrsStatementLineItems [Line Items]    
Amount per common and preferred share $ 0.1875  
Dividend payables $ 2,417