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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 |

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