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ACCOUNTING PRINCIPLES - Situation in Ukraine and collateral consequences (Details)
tonne in Millions, shipment in Millions, $ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Apr. 11, 2022
blastFurnace
Oct. 31, 2022
Jun. 30, 2022
Dec. 31, 2022
USD ($)
tonne
shipment
Dec. 31, 2021
USD ($)
shipment
tonne
Dec. 31, 2020
USD ($)
Disclosure of changes in accounting estimates [line items]            
Property, plant and equipment       $ 30,167 $ 30,075  
Revenue from contracts with customers       79,844 76,571 $ 53,270
Impairment reversal       $ 1,026 $ (218) (133)
Ukraine            
Disclosure of changes in accounting estimates [line items]            
Steel plant capacity (in tonnes) | tonne       1.2 4.9  
Mines iron ore capacity (in tonnes) | tonne       4.9 11.7  
Property, plant and equipment       $ 600 $ 2,300  
Steel shipment recorded | shipment       1.1 4.6  
Revenue from contracts with customers       $ 464 $ 948 $ 515
Revenue from contracts with customers located in Ukraine       400 900  
Number of restarted blast furnaces | blastFurnace 1          
Number of blast furnaces | blastFurnace 3          
Percentage of Kryvyi Rih capacity 20.00% 25.00% 55.00%      
Assets held for sale       0    
Ukraine | Kryvyi Rih Steel Plant            
Disclosure of changes in accounting estimates [line items]            
Revenue from contracts with customers       1,400 $ 4,100  
Ukraine | Property, plant and equipment            
Disclosure of changes in accounting estimates [line items]            
Impairment reversal       $ 1,026