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Investments in associates and joint ventures -Carrying amount, equity in results and dividend received (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investments in associates and joint ventures      
Investments in associates and joint ventures $ 3,225 $ 3,568 $ 3,696
Equity results in income statement 305 98 309
Dividends received $ 245 227 193
VLI S.A.      
Investments in associates and joint ventures      
% Ownership 37.60%    
% Voting capital 37.60%    
Henan Longyu Energy Resources Co., Ltd.      
Investments in associates and joint ventures      
% Ownership 25.00%    
% Voting capital 25.00%    
Companhia Coreano-Brasileira de Pelotizacao      
Investments in associates and joint ventures      
% Voting capital 50.00%    
Companhia Hispano-Brasileira de Pelotizacao      
Investments in associates and joint ventures      
% Voting capital 51.00%    
Companhia Italo-Brasileira de Pelotizacao      
Investments in associates and joint ventures      
% Voting capital 51.00%    
Companhia Nipo-Brasileira de Pelotizacao      
Investments in associates and joint ventures      
% Voting capital 51.10%    
MRS Logistica S.A.      
Investments in associates and joint ventures      
% Voting capital 46.80%    
Samarco Mineracao S.A.      
Investments in associates and joint ventures      
% Voting capital 50.00%    
Alianca Geracao de Energia S.A.      
Investments in associates and joint ventures      
% Voting capital 55.00%    
Ferrous minerals      
Investments in associates and joint ventures      
Investments in associates and joint ventures $ 1,814 1,922  
Equity results in income statement 417 329 179
Dividends received $ 189 130 113
Ferrous minerals | VLI S.A.      
Investments in associates and joint ventures      
% Ownership 37.60%    
% Voting capital 37.60%    
Investments in associates and joint ventures $ 857 968  
Equity results in income statement 30 29 36
Dividends received $ 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 $ 22 23  
Ferrous minerals | Baovale Mineracao S.A      
Investments in associates and joint ventures      
% Voting capital 50.00%    
Investments in associates and joint ventures $ 23 26  
Equity results in income statement 5 7 9
Dividends received $ 1 1  
Ferrous minerals | Companhia Coreano-Brasileira de Pelotizacao      
Investments in associates and joint ventures      
% Voting capital 50.00%    
Investments in associates and joint ventures $ 104 89  
Equity results in income statement 69 50 17
Dividends received $ 32 19 26
Ferrous minerals | Companhia Hispano-Brasileira de Pelotizacao      
Investments in associates and joint ventures      
% Voting capital 51.00%    
Investments in associates and joint ventures $ 83 82  
Equity results in income statement 55 41 15
Dividends received $ 23 16 27
Ferrous minerals | Companhia Italo-Brasileira de Pelotizacao      
Investments in associates and joint ventures      
% Voting capital 51.00%    
Investments in associates and joint ventures $ 81 80  
Equity results in income statement 60 40 16
Dividends received $ 32 17 9
Ferrous minerals | Companhia Nipo-Brasileira de Pelotizacao      
Investments in associates and joint ventures      
% Voting capital 51.11%    
Investments in associates and joint ventures $ 148 137  
Equity results in income statement 126 93 29
Dividends received $ 67 29 41
Ferrous minerals | MRS Logistica S.A.      
Investments in associates and joint ventures      
% Voting capital 46.75%    
Investments in associates and joint ventures $ 496 517  
Equity results in income statement 72 69 57
Dividends received 27 29 10
Coal      
Investments in associates and joint ventures      
Investments in associates and joint ventures 317 317  
Equity results in income statement $ 16 20 (4)
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 $ 317 317  
Equity results in income statement 16 20 (4)
Base metals      
Investments in associates and joint ventures      
Investments in associates and joint ventures 14 13  
Equity results in income statement $ 1 1 (4)
Dividends received     4
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 13  
Equity results in income statement 1 1 (1)
Dividends received     4
Base metals | Teal Minerals Inc.      
Investments in associates and joint ventures      
Equity results in income statement     (3)
Others      
Investments in associates and joint ventures      
Investments in associates and joint ventures 1,080 1,316  
Equity results in income statement (129) (252) 138
Dividends received $ 56 97 76
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 $ 93 101  
Equity results in income statement 2 13 48
Dividends received   41 32
Others | Others      
Investments in associates and joint ventures      
Investments in associates and joint ventures 92 22  
Equity results in income statement $ (5) (68) (8)
Dividends received     1
Others | Alianca Geracao de Energia S.A.      
Investments in associates and joint ventures      
% Voting capital 55.00%    
Investments in associates and joint ventures $ 486 571  
Equity results in income statement 25 27 46
Dividends received $ 25 29 39
Others | Alianca Norte Energia Participacoes S.A.      
Investments in associates and joint ventures      
% Voting capital 51.00%    
Investments in associates and joint ventures $ 162 160  
Equity results in income statement $ 15 (2) (6)
Others | California Steel Industries, Inc      
Investments in associates and joint ventures      
% Voting capital 50.00%    
Investments in associates and joint ventures $ 247 200  
Equity results in income statement 77 42 33
Dividends received $ 31 27 4
Others | Companhia Siderurgica do Pecem      
Investments in associates and joint ventures      
% Voting capital 50.00%    
Investments in associates and joint ventures   262  
Equity results in income statement $ (243) $ (264) $ 25