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Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS - Pro Forma (Details)

v3.20.4
ACQUISITIONS - Pro Forma (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Ìý Ìý
Business Acquisition, Pro Forma Revenue $ 12,837 $ 17,163
Business Acquisition, Pro Forma Net Income (Loss) (520) (11)
Business Acquisition, Pro Forma Expenses $ 32 76
Business Acquisition, Pro Forma Income Tax, Statutory Rate 24.30% Ìý
Business Acquisition, Pro Forma Income Tax Benefit (Expense) $ 170 117
Intersegment Eliminations [Member] Ìý Ìý
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Ìý Ìý
Business Acquisition, Pro Forma Revenue 844 1,499
Franchise Ìý Ìý
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Ìý Ìý
Business Acquisition, Pro Forma Net Income (Loss) 140 129
Fair Value Adjustment to Inventory Ìý Ìý
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Ìý Ìý
Business Acquisition, Pro Forma Net Income (Loss) 96 362
Acquisition-related Costs | ArcelorMittal USA and AK Steel [Member] Ìý Ìý
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Ìý Ìý
Business Acquisition, Pro Forma Net Income (Loss) 93 $ 93
Restructuring Costs | ArcelorMittal USA [Member] Ìý Ìý
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Ìý Ìý
Business Acquisition, Pro Forma Net Income (Loss) $ 1,820 Ìý