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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, 2021
Dec. 31, 2020
Provisions.    
Other provisions $ 4,580 $ 4,522
Asset retirement obligations and environmental obligations    
Provisions.    
Other provisions 4,580 4,522
Brazil | Asset retirement obligations and environmental obligations    
Provisions.    
Other provisions $ 1,398 1,530
Discount rate 5.48%  
Flow duration $ 2,119  
Canada | Asset retirement obligations and environmental obligations    
Provisions.    
Other provisions $ 2,727 2,491
Discount rate 0.00%  
Flow duration $ 2,151  
Oman | Asset retirement obligations and environmental obligations    
Provisions.    
Other provisions $ 123 105
Discount rate 3.03%  
Flow duration $ 2,035  
Indonesia | Asset retirement obligations and environmental obligations    
Provisions.    
Other provisions $ 77 60
Discount rate 4.20%  
Flow duration $ 2,061  
Other regions | Asset retirement obligations and environmental obligations    
Provisions.    
Other provisions $ 255 $ 336
Other regions | Asset retirement obligations and environmental obligations | Minimum    
Provisions.    
Discount rate 0.00%  
Other regions | Asset retirement obligations and environmental obligations | Maximum    
Provisions.    
Discount rate 7.79%