Cleveland-Cliffs Inc. Quarterly report pursuant to Section 13 or 15(d)

INCOME TAXES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
INCOME TAXES - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ (15)	$ 102	$ (23)	$ 89

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.