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DERIVATIVE INSTRUMENTS	12 Months Ended
DERIVATIVE INSTRUMENTS	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS	Derivatives Not Designated as Hedging Instruments Customer Supply Agreement A supply agreement with ArcelorMittal USA provided us supplemental revenue or provided refunds to ArcelorMittal USA based on the HRC price at the time the iron ore product was consumed in its blast furnaces. The supplemental pricing is characterized as a freestanding derivative instrument and is required to be accounted for separately once control transfers to the customer. The derivative instrument, which is finalized based on a future price, is adjusted to fair value through Revenues each reporting period based upon current market data and forward-looking estimates provided by management until the pellets are consumed and the amounts are settled. Upon the completion of the AM USA Transaction, the outstanding derivatives were settled as part of acquisition accounting. Included within Revenues related to Topic 815 for the supplemental revenue portion of the supply agreement is derivative revenue of $122 million, $78 million and $426 million for the years ended December 31, 2020, 2019 and 2018, respectively. Refer to NOTE 9 - FAIR VALUE OF FINANCIAL INSTRUMENTS for additional information.