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Provision for de-characterization of dam structures and asset retirement obligations - Provision changes during (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Balance at the beginning $ 3,803 $ 4,580  
Adjustment to present value 65 27  
Disbursements (112) (70)  
Revisions on projected cash flows 73 (1,151) [1]  
Transfer to assets held for sale   (51)  
Translation adjustment 195 51  
Balance at the end 4,024 3,386  
Balance at the end 4,024 3,386 $ 3,803
Current 397   304
Non-current 3,627   3,499
Liability 4,024   3,803
Provision for decommissioning, restoration and rehabilitation costs [member]      
IfrsStatementLineItems [Line Items]      
Balance at the beginning 3,466 4,283  
Adjustment to present value 64 26  
Disbursements (61) (42)  
Revisions on projected cash flows (7) (1,145) [1]  
Transfer to assets held for sale   (49)  
Translation adjustment 168 33  
Balance at the end 3,630 3,106  
Balance at the end 3,630 3,106 3,466
Current 243   210
Non-current 3,387   3,256
Liability 3,630   3,466
Other environment related provision [member]      
IfrsStatementLineItems [Line Items]      
Balance at the beginning 337 297  
Adjustment to present value 1 1  
Disbursements (51) (28)  
Revisions on projected cash flows 80 (6) [1]  
Transfer to assets held for sale   (2)  
Translation adjustment 27 18  
Balance at the end 394 280  
Balance at the end 394 $ 280 337
Current 154   94
Non-current 240   243
Liability $ 394   $ 337
[1] The pension plan asset is recorded as “Other non-current assets” in the statement of financial position.