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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
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Other provisions $ 3,312 $ 3,537  
Other provisions 3,803 4,580 $ 4,522
Asset retirement obligations and environmental obligations | Brazil [Member]      
IfrsStatementLineItems [Line Items]      
Other provisions $ 1,788 $ 1,398  
Discount rate 6.20% 5.48%  
Cash flow maturity $ 2,096 $ 2,119  
Asset retirement obligations and environmental obligations | Canada [Member]      
IfrsStatementLineItems [Line Items]      
Other provisions $ 1,683 $ 2,727  
Discount rate 1.11% 0.00%  
Cash flow maturity $ 2,148 $ 2,151  
Asset retirement obligations and environmental obligations | Oman [Member]      
IfrsStatementLineItems [Line Items]      
Other provisions $ 114 $ 123  
Discount rate 3.90% 3.03%  
Cash flow maturity $ 2,035 $ 2,035  
Asset retirement obligations and environmental obligations | Indonesia [Member]      
IfrsStatementLineItems [Line Items]      
Other provisions $ 73 $ 77  
Discount rate 4.33% 4.20%  
Cash flow maturity $ 2,061 $ 2,061  
Asset retirement obligations and environmental obligations | Indonesia [Member] | Bottom of range [member]      
IfrsStatementLineItems [Line Items]      
Discount rate 1.84% 0.00%  
Asset retirement obligations and environmental obligations | Indonesia [Member] | Top of range [member]      
IfrsStatementLineItems [Line Items]      
Discount rate 2.00% 0.57%  
Asset retirement obligations and environmental obligations | Other regions      
IfrsStatementLineItems [Line Items]      
Other provisions $ 145 $ 255