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Cash flows reconciliation - cash flow from investing activities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Cash Flows Reconciliation        
Cash received from the sale of California Steel Industries $ 437
Cash received from the sale of Companhia Siderúrgica do Pecém 1,082
Cash contribution to Companhia Siderúrgica do Pecém (1,149)
Proceeds (payments) from disposal of investments, net $ (67) $ 437