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Provision for de-characterization of dam structures and asset retirement obligations (Details 2) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Other provisions $ 1,970 $ 3,060
Total other provisions 3,550 4,278
Provision For Decommissioning Restoration And Rehabilitation Costs And Environmental Provisions [Member]    
IfrsStatementLineItems [Line Items]    
Other provisions 3,550 4,278
Provision For Decommissioning Restoration And Rehabilitation Costs And Environmental Provisions [Member] | Country Of Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Other provisions $ 1,784 $ 2,415
Discount rate 7.38% 5.47%
Cash flow maturity $ 2,132 $ 2,132
Provision For Decommissioning Restoration And Rehabilitation Costs And Environmental Provisions [Member] | Country Of Canada [Member]    
IfrsStatementLineItems [Line Items]    
Other provisions $ 1,520 $ 1,592
Discount rate 1.44% 1.30%
Cash flow maturity $ 2,152 $ 2,150
Provision For Decommissioning Restoration And Rehabilitation Costs And Environmental Provisions [Member] | Country Of Oman [Member]    
IfrsStatementLineItems [Line Items]    
Other provisions $ 142 $ 158
Discount rate 3.66% 3.19%
Cash flow maturity $ 2,035 $ 2,035
Provision For Decommissioning Restoration And Rehabilitation Costs And Environmental Provisions [Member] | Other Regions [Member]    
IfrsStatementLineItems [Line Items]    
Other provisions $ 104 $ 113
Discount rate 2.77% 2.04%
Cash flow maturity
Operating Plants [Member]    
IfrsStatementLineItems [Line Items]    
Other provisions 2,509 3,155
Closed Plants [Member]    
IfrsStatementLineItems [Line Items]    
Other provisions $ 1,041 $ 1,123