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Provision for de-characterization of dam structures and asset retirement obligations - De-characterization of dam structures located in Brazil (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Provisions.      
Losses related to operational stoppage and idle capacity   $ 1,725  
De-characterization of dam structures located in Brazil      
Provisions.      
Additional provision $ 1,725 $ 1,725 $ 617
Term for de-characterization of projects   15 years  
Losses related to operational stoppage and idle capacity   $ 376 $ 634
De-characterization of dam structures located in Brazil | Minimum      
Provisions.      
Discount rate (in percent)     3.50%
De-characterization of dam structures located in Brazil | Maximum      
Provisions.      
Discount rate (in percent)   5.48%