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FAIR VALUE MEASUREMENTS (Tables)
 3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
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)
March 31, 2021December 31, 2020
Classification
Carrying
Value
Fair Value
Carrying
Value
Fair Value
Senior NotesLevel 1$3,957 $4,674 $3,802 $4,446 
IRBs due 2024 to 2028Level 194 94 94 91 
EDC Revolving Facilities - outstanding balanceLevel 253 53 18 18 
ABL Facility - outstanding balanceLevel 21,630 1,630 1,510 1,510 
Total long-term debt$5,734 $6,451 $5,424 $6,065