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Debentures (Tables)
 6 Months Ended
Aug. 31, 2023
Debt Disclosure [Abstract]  
Schedule of Debentures
The following table summarizes the change in fair value of the Debentures for the six months ended August 31, 2023, which also represents the total changes through earnings of items classified as Level 3 in the fair value hierarchy:
As at
  August 31, 2023
Balance as at February 28, 2023$367 
Change in fair value of the Debentures16 
Balance as at August 31, 2023$383 
1.75% Debenture - impact of changes in fair value
The following table shows the impact of the changes in fair value of the Debentures for the three and six months ended August 31, 2023 and August 31, 2022:    
Three Months EndedSix Months Ended
  August 31, 2023August 31, 2022August 31, 2023August 31, 2022
Income (charge) associated with the change in fair value from non-credit components recorded in the consolidated statements of operations $6 $10 $(16)$56 
Income associated with the change in fair value from instrument-specific credit components recorded in AOCL— — — 2 
Total decrease (increase) in the fair value of the Debentures $6 $10 $(16)$58