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Investments in associates and joint ventures - Carrying amount, equity in results and dividend (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investments in associates and joint ventures      
Investments in associates and joint ventures $ 2,798 $ 3,225 $ 3,568
Equity results in income statement 228 305 98
Dividends received 353 245 227
Ferrous minerals      
Investments in associates and joint ventures      
Investments in associates and joint ventures 1,729 1,814  
Equity results in income statement 254 417 329
Dividends received $ 296 189 130
Ferrous minerals | VLI S.A.      
Investments in associates and joint ventures      
% Ownership 37.60%    
% Voting capital 37.60%    
Investments in associates and joint ventures $ 812 857  
Equity results in income statement 1 30 29
Dividends received $ 9 7 19
Ferrous minerals | Zhuhai YPM Pellet Co      
Investments in associates and joint ventures      
% Ownership 25.00%    
% Voting capital 25.00%    
Investments in associates and joint ventures $ 23 22  
Ferrous minerals | Baovale Mineracao S.A      
Investments in associates and joint ventures      
% Ownership 50.00%    
% Voting capital 50.00%    
Investments in associates and joint ventures $ 25 23  
Equity results in income statement $ 4 5 7
Dividends received   1 1
Ferrous minerals | Companhia Coreano-Brasileira de Pelotizacao      
Investments in associates and joint ventures      
% Ownership 50.00%    
% Voting capital 50.00%    
Investments in associates and joint ventures $ 88 104  
Equity results in income statement 48 69 50
Dividends received $ 62 32 19
Ferrous minerals | Companhia Hispano-Brasileira de Pelotizacao      
Investments in associates and joint ventures      
% Ownership 50.89%    
% Voting capital 50.89%    
Investments in associates and joint ventures $ 70 83  
Equity results in income statement 37 55 41
Dividends received $ 50 23 16
Ferrous minerals | Companhia Italo-Brasileira de Pelotizacao      
Investments in associates and joint ventures      
% Ownership 50.90%    
% Voting capital 51.00%    
Investments in associates and joint ventures $ 65 81  
Equity results in income statement 30 60 40
Dividends received $ 54 32 17
Ferrous minerals | Companhia Nipo-Brasileira de Pelotizacao      
Investments in associates and joint ventures      
% Ownership 51.00%    
% Voting capital 51.11%    
Investments in associates and joint ventures $ 150 148  
Equity results in income statement 84 126 93
Dividends received $ 92 67 29
Ferrous minerals | MRS Logistica S.A.      
Investments in associates and joint ventures      
% Ownership 48.16%    
% Voting capital 46.75%    
Investments in associates and joint ventures $ 496 496  
Equity results in income statement 50 72 69
Dividends received 29 27 29
Coal      
Investments in associates and joint ventures      
Investments in associates and joint ventures   317  
Equity results in income statement $ (2) 16 20
Coal | Henan Longyu Energy Resources Co., Ltd.      
Investments in associates and joint ventures      
% Ownership 25.00%    
% Voting capital 25.00%    
Investments in associates and joint ventures   317  
Equity results in income statement $ (2) 16 20
Base metals      
Investments in associates and joint ventures      
Investments in associates and joint ventures $ 14 14  
Equity results in income statement   1 1
Base metals | Korea Nickel Corp      
Investments in associates and joint ventures      
% Ownership 25.00%    
% Voting capital 25.00%    
Investments in associates and joint ventures $ 14 14  
Equity results in income statement   1 1
Others      
Investments in associates and joint ventures      
Investments in associates and joint ventures 1,055 1,080  
Equity results in income statement (24) (129) (252)
Dividends received $ 57 56 97
Others | Mineracao Rio Grande do Norte S.A.      
Investments in associates and joint ventures      
% Ownership 40.00%    
% Voting capital 40.00%    
Investments in associates and joint ventures $ 97 93  
Equity results in income statement 15 2 13
Dividends received     41
Others | Others      
Investments in associates and joint ventures      
Investments in associates and joint ventures 86 92  
Equity results in income statement $ (28) (5) (68)
Others | Alianca Geracao de Energia S.A.      
Investments in associates and joint ventures      
% Ownership 55.00%    
% Voting capital 55.00%    
Investments in associates and joint ventures $ 470 486  
Equity results in income statement 31 25 27
Dividends received $ 28 25 29
Others | Alianca Norte Energia Participacoes S.A.      
Investments in associates and joint ventures      
% Ownership 51.00%    
% Voting capital 51.00%    
Investments in associates and joint ventures $ 160 162  
Equity results in income statement $ 4 15 (2)
Others | California Steel Industries, Inc      
Investments in associates and joint ventures      
% Ownership 50.00%    
% Voting capital 50.00%    
Investments in associates and joint ventures $ 242 247  
Equity results in income statement 23 77 42
Dividends received $ 29 31 27
Others | Companhia Siderurgica do Pecem      
Investments in associates and joint ventures      
% Ownership 50.00%    
% Voting capital 50.00%    
Equity results in income statement $ (69) $ (243) $ (264)