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

Quarterly report pursuant to Section 13 or 15(d)

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in AOCI (loss) related to shareholders' equity (Details)

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in AOCI (loss) related to shareholders' equity (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ (66)	$ (120)	$ (133)	$ (306)	$ (317)	$ (319)
Other comprehensive income (loss) before reclassifications	93	51	7	14	2	(6)
Net (income) loss reclassified from AOCI	(4)	3	6	10	9	8
Ending balance	23	(66)	(120)	(282)	(306)	(317)
Postretirement Benefit Liability, net of tax
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(121)	(128)	(135)	(304)	(310)	(316)
Other comprehensive income (loss) before reclassifications	0	0	0	0	0	0
Net (income) loss reclassified from AOCI	6	7	7	6	6	6
Ending balance	(115)	(121)	(128)	(298)	(304)	(310)
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	2	2	3	0	(1)	0
Other comprehensive income (loss) before reclassifications	0	0	(1)	2	1	(1)
Net (income) loss reclassified from AOCI	0	0	0	0	0	0
Ending balance	2	2	2	2	0	(1)
Derivative Financial Instruments, net of tax
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	53	6	(1)	(2)	(6)	(3)
Other comprehensive income (loss) before reclassifications	93	51	8	12	1	(5)
Net (income) loss reclassified from AOCI	(10)	(4)	(1)	4	3	2
Ending balance	$ 136	$ 53	$ 6	$ 14	$ (2)	$ (6)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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