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