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Cash flows reconciliation - Cash folw from operating activities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash flow from operating activities:      
Income before income taxes $ 19,781 $ 29,541 $ 6,990
Adjusted for:      
Equity results and other results in associates and joint ventures (305) 1,271 1,020
Impairment and disposals (impairment reversal) of non-current assets, net (773) 426 1,308
Provisions related to Brumadinho 400 201 4,130
Provision for de-characterization of dams 72 1,725 617
Depreciation, depletion and amortization 3,171 3,034 3,215
Financial results, net (2,268) (3,119) 4,813
Changes in assets and liabilities:      
Accounts receivable (325) 1,029 (2,544)
Inventories 45 (503) (183)
Suppliers and contractors 495 251 (222)
Other assets and liabilities, net (1,531) (442) (250)
Cash flow from operations $ 18,762 $ 33,414 $ 18,894