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Debentures (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Nov. 30, 2021
Nov. 30, 2020
Feb. 28, 2021
Sep. 01, 2020
Debt Instrument [Line Items]            
Long-term debentures (note 6) $ 673   $ 673   $ 720  
1.75% Debenture            
Debt Instrument [Line Items]            
Face amount of debt 365   365      
Unpaid principal balance 365   365      
Fair Value, Option, Aggregate Differences, Long-term Debt Instruments (308)   (308)      
Interest expense, debt 2   5      
Related Party Principal Amounts of 1.75% Debenture Owned $ 330   $ 330      
Fair Value Inputs, Entity Credit Risk 6.27%   6.27%     7.90%
Long-term debentures (note 6) $ 673   $ 673   $ 720 $ 456
Debenture implied discount           91
3.75% Debenture            
Debt Instrument [Line Items]            
Face amount of debt           605
Interest expense, debt   $ 2   $ 13    
Related party principal amounts of 3.75% debenture owned           500
Debt Instrument, Repurchase Amount           $ 615
Debt Instrument, Repurchase Date         Sep. 01, 2020