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Provision for de-characterization of dam structures and asset retirement obligations - Asset retirement obligations and environmental obligations (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Other provisions $ 4,024 $ 3,803
Provision For Decommissioning Restoration And Rehabilitation Costs And Environmental Provisions [Member] | Country Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Other provisions $ 2,035 $ 1,788
Discount rate 5.46% 6.20%
Cash flow maturity 2096 2096
Provision For Decommissioning Restoration And Rehabilitation Costs And Environmental Provisions [Member] | Country Canada [Member]    
IfrsStatementLineItems [Line Items]    
Other provisions $ 1,649 $ 1,683
Discount rate   1.11%
Cash flow maturity 2151 2148
Provision For Decommissioning Restoration And Rehabilitation Costs And Environmental Provisions [Member] | Country Canada [Member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Discount rate 1.35%  
Provision For Decommissioning Restoration And Rehabilitation Costs And Environmental Provisions [Member] | Country Canada [Member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Discount rate 1.61%  
Provision For Decommissioning Restoration And Rehabilitation Costs And Environmental Provisions [Member] | Country Oman [Member]    
IfrsStatementLineItems [Line Items]    
Other provisions $ 114 $ 114
Discount rate 3.25% 3.90%
Cash flow maturity 2035 2035
Provision For Decommissioning Restoration And Rehabilitation Costs And Environmental Provisions [Member] | Country Indonesia [Member]    
IfrsStatementLineItems [Line Items]    
Other provisions $ 87 $ 73
Discount rate 3.76% 4.33%
Cash flow maturity 2062 2061
Provision For Decommissioning Restoration And Rehabilitation Costs And Environmental Provisions [Member] | Other Regions [Member]    
IfrsStatementLineItems [Line Items]    
Other provisions $ 139 $ 145
Provision For Decommissioning Restoration And Rehabilitation Costs And Environmental Provisions [Member] | Other Regions [Member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Discount rate 1.70% 1.84%
Provision For Decommissioning Restoration And Rehabilitation Costs And Environmental Provisions [Member] | Other Regions [Member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Discount rate 2.45% 2.00%