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FAIR VALUE MEASUREMENTS
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
FAIR VALUE MEASUREMENTS
The carrying values of certain financial instruments (e.g., Accounts receivable, net, Accounts payable and Other current liabilities) approximate fair value and, therefore, have been excluded from the table below. 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 
The fair value of long-term debt was determined using quoted market prices.