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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
20202019
Beginning balance - January 1$45 $89 
Total gains included in earnings122 79 
Settlements(27)(123)
Settlement of pre-existing relationship(140)— 
Ending balance - December 31$ $45 
Total gains for the period included in earnings attributable to the change in unrealized gains on assets still held at the reporting date$ $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, 2020December 31, 2019
ClassificationCarrying
Value
Fair ValueCarrying
Value
Fair Value
Senior notesLevel 1$3,802 $4,446 $2,114 $2,237 
IRBs due 2024 to 2028Level 194 91 — — 
EDC Revolving Facility - outstanding balanceLevel 218 18 — — 
ABL Facility - outstanding balanceLevel 21,510 1,510 — — 
Total$5,424 $6,065 $2,114 $2,237