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Annual report pursuant to Section 13 and 15(d)

GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES - Goodwill (Details)

v3.20.4
GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES - Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Mar. 13, 2020
Dec. 31, 2019
Goodwill [Line Items] Ìý Ìý Ìý
Goodwill $ 1,406 Ìý $ 2
ArcelorMittal USA [Member] Ìý Ìý Ìý
Goodwill [Line Items] Ìý Ìý Ìý
Goodwill 1,230 Ìý Ìý
AK Steel [Member] Ìý Ìý Ìý
Goodwill [Line Items] Ìý Ìý Ìý
Goodwill 174 $ 141 Ìý
Steelmaking [Member] Ìý Ìý Ìý
Goodwill [Line Items] Ìý Ìý Ìý
Goodwill 1,232 Ìý 2
Steelmaking [Member] | ArcelorMittal USA [Member] Ìý Ìý Ìý
Goodwill [Line Items] Ìý Ìý Ìý
Goodwill, Period Increase (Decrease) 1,230 Ìý Ìý
Other businesses Ìý Ìý Ìý
Goodwill [Line Items] Ìý Ìý Ìý
Goodwill 174 Ìý $ 0
Other businesses | AK Steel [Member] Ìý Ìý Ìý
Goodwill [Line Items] Ìý Ìý Ìý
Goodwill, Period Increase (Decrease) $ 174 Ìý Ìý