FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

Fair Value, by Balance Sheet Grouping [Table Text Block]

The following represents the assets and liabilities measured at fair value as of December 31, 2019:

	(In Millions)
	December 31, 2019
	Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Cash equivalents - Commercial paper	$	—	$	188	$	—	$	188
Other current assets:
Customer supply agreement	—		—		45		45
Total	$	—	$	188	$	45	$	233

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation

The following tables represent a reconciliation of the changes in fair value of financial instruments measured at fair value on a recurring basis using significant unobservable inputs (Level 3):

	(In Millions)
	Level 3 Assets
	2020		2019
Beginning balance - January 1	$	45	$	89
Total gains included in earnings	122		79
Settlements	(27)		(123)
Settlement of pre-existing relationship	(140)		—
Ending balance - December 31	$	—	$	45
Total gains for the period included in earnings attributable to the change in unrealized gains on assets still held at the reporting date	$	—	$	45

Schedule Of Carrying Value And Fair Value Of Financial Instruments

A summary of the carrying value and fair value of other financial instruments were as follows:

		(In Millions)
		December 31, 2020				December 31, 2019
	Classification	Carrying Value		Fair Value		Carrying Value		Fair Value
Senior notes	Level 1	$	3,802	$	4,446	$	2,114	$	2,237
IRBs due 2024 to 2028	Level 1	94		91		—		—
EDC Revolving Facility - outstanding balance	Level 2	18		18		—		—
ABL Facility - outstanding balance	Level 2	1,510		1,510		—		—
Total		$	5,424	$	6,065	$	2,114	$	2,237