Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES - Goodwill (Details)

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GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES - Goodwill (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Goodwill [Line Items]    
Goodwill $ 1,070 $ 1,406
Steelmaking    
Goodwill [Line Items]    
Goodwill 896 1,232
Goodwill, period increase (decrease) (336)  
Other Businesses    
Goodwill [Line Items]    
Goodwill $ 174 $ 174