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Capital Stock - Changes in Issued and Outstanding Common Shares (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Nov. 30, 2021 | Nov. 30, 2020 | Nov. 30, 2021 | Nov. 30, 2020
Common Stock [Roll Forward] |  |  |  |
Capital stock outstanding, Shares, Beginning Balance |  |  | 565,505,328 |
Capital stock outstanding, Shares, Ending Balance | 573,666,612 |  | 573,666,612 |
Common Stock, Amount [Roll Forward] |  |  |  |
Exercise of stock options |  | $ 1 | $ 2 | $ 3
Stock-based compensation | $ 8 | 11 | 25 | 33
Employee share purchase plan | $ 4 | 3 | $ 7 | 7
Capital Stock and Additional Paid-in Capital |  |  |  |
Common Stock [Roll Forward] |  |  |  |
Capital stock outstanding, Shares, Beginning Balance |  |  | 565,505,000 |
Exercise of stock options |  |  | 460,000 |
Common shares issued for restricted share unit settlements |  |  | 6,967,000 |
Common shares issued for employee share purchase plan |  |  | 735,000 |
Capital stock outstanding, Shares, Ending Balance | 573,667,000 |  | 573,667,000 |
Common Stock, Amount [Roll Forward] |  |  |  |
Common Stock, Value, Outstanding |  |  | $ 2,823 |
Exercise of stock options |  | 1 | 2 | 3
Stock-based compensation | $ 8 | 11 | 25 | 33
Employee share purchase plan | 4 | $ 3 | 7 | $ 7
Common Stock, Value, Outstanding | $ 2,857 |  | $ 2,857 |

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