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FINANCIAL INSTRUMENTS - Narrative investments (Details) - Ordinary shares - Cleveland-Cliffs Inc. - USD ($)
shares in Millions, $ in Millions
6 Months Ended
Jun. 30, 2021
Jul. 28, 2021
Jun. 18, 2021
Feb. 09, 2021
Disclosure of fair value measurement of assets [line items]        
Number of shares divested (in shares)     38.2 40.0
Consideration received $ 1,377      
Gain recognized in OCI, before tax 357      
Gain recognized in OCI, after tax $ 267      
Other disposals of assets [member]        
Disclosure of fair value measurement of assets [line items]        
Consideration received   $ 1,235