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Other financial assets and liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Other financial assets    
Derivative financial instruments- current $ 111 $ 134
Loans - Related parties - Current   195
Total other financial assets - Current 111 329
Restricted cash-noncurrent 117 38
Derivative financial instruments - Non-Current 20 66
Investments in equity securities -Non- Current 6 757
Loans - Related parties - Non Current   923
Total other financial assets - Non-Current 143 1,784
Other financial liabilities    
Derivative financial instruments - Current 243 328
Loans - Related parties Current   490
Other financial liabilities - Related parties - Current 393 235
Liabilities related to the concession grant-Current 760 209
Contract liability - Current 566 644
Total other financial liabilities - Current 1,962 1,906
Derivative financial instruments - Non-Current 592 689
Loans - Related parties - Non-Current   895
Financial guarantees provided -Non current 542 877
Liabilities related to the concession grant-Non current 1,437 2,103
Total other financial liabilities - Non-Current 2,571 $ 4,564
Boston Electrometallurgical Company    
Other financial assets    
Investments in equity securities -Non- Current $ 6  
Other financial liabilities    
% Noncontrolling interest 3.24%