Capital Stock - Changes in Issued and Outstanding Common Shares (Details) - USD ($) $ in Millions	3 Months Ended
	May 31, 2022	May 31, 2021
Common Stock [Roll Forward]
Capital stock outstanding, Shares, Beginning Balance	576,227,898
Capital stock outstanding, Shares, Ending Balance	577,168,941
Common Stock, Amount [Roll Forward]
Exercise of stock options	$ 0	$ 1
Stock-based compensation	8	7
Employee share purchase plan	$ 3	3
Capital Stock and Additional Paid-in Capital
Common Stock [Roll Forward]
Capital stock outstanding, Shares, Beginning Balance	576,228,000
Exercise of stock options	27,000
Common shares issued for restricted share unit settlements	456,000
Common shares issued for employee share purchase plan	458,000
Capital stock outstanding, Shares, Ending Balance	577,169,000
Common Stock, Amount [Roll Forward]
Common Stock, Value, Outstanding	$ 2,869
Exercise of stock options	0	1
Stock-based compensation	8	7
Employee share purchase plan	3	$ 3
Common Stock, Value, Outstanding	$ 2,880