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Provision for de-characterization of dam structures and asset retirement obligations - Changes in the provisions (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Provisions.      
Balance at the beginning   $ 4,522  
Balance at the end $ 4,580 4,580 $ 4,522
Current liabilities 1,045 1,045 1,664
Non-current liabilities 3,419 3,419 4,113
Liabilities 4,580 4,580 4,522
De-characterization of dam structures located in Brazil      
Provisions.      
Balance at the beginning   2,289 2,489
Additional provision 1,725 1,725 617
Disbursements   (338) (293)
Present value valuation   (36) 36
Translation adjustment   (117) (560)
Balance at the end 3,523 3,523 2,289
Current liabilities 451 451 381
Non-current liabilities 3,072 3,072 1,908
Liabilities $ 3,523 $ 3,523 $ 2,289