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Quarterly report pursuant to Section 13 or 15(d)

ACQUISITIONS - Narrative (Details)

v3.21.2
ACQUISITIONS - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 09, 2020
USD ($)
Mar. 13, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
business
Business Acquisition [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Number of businesses acquired | business Ìý Ìý Ìý Ìý Ìý Ìý 2
Acquisition-related costs Ìý Ìý $ 1 $ 19 $ 14 $ 61 Ìý
Other Operating Income (Expense) Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Business Acquisition [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Equity interest loss Ìý Ìý $ 18 Ìý Ìý Ìý Ìý
ArcelorMittal USA Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Business Acquisition [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Acquisition-related costs Ìý Ìý Ìý Ìý $ 2 Ìý Ìý
Consideration transferred $ 2,604 Ìý Ìý Ìý Ìý Ìý Ìý
AK Steel Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Business Acquisition [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Exchange ratio Ìý 0.400 Ìý Ìý Ìý Ìý Ìý
Consideration transferred Ìý $ 1,535 Ìý Ìý Ìý Ìý Ìý