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Provision for de-characterization of dam structures and asset retirement obligations (Details 1) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Other provisions $ 2,412 $ 3,060
Total other provisions 3,702 4,279
Provision For Decommissioning Restoration And Rehabilitation Costs And Environmental Provisions [Member]    
IfrsStatementLineItems [Line Items]    
Other provisions 3,702 4,279
Provision For Decommissioning Restoration And Rehabilitation Costs And Environmental Provisions [Member] | Country Of Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Other provisions $ 1,914 $ 2,415
Discount rate 6.41% 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 $ 1,529 $ 1,592
Discount rate 1.47% 1.30%
Cash flow maturity $ 2,150 $ 2,150
Provision For Decommissioning Restoration And Rehabilitation Costs And Environmental Provisions [Member] | Country Of Oman [Member]    
IfrsStatementLineItems [Line Items]    
Other provisions $ 159 $ 158
Discount rate 3.46% 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 $ 100 $ 114
Discount rate 2.43% 2.04%
Operating Plants [Member]    
IfrsStatementLineItems [Line Items]    
Other provisions $ 2,869 $ 3,155
Closed Plants [Member]    
IfrsStatementLineItems [Line Items]    
Other provisions $ 833 $ 1,124