Income Taxes - Components of Provision for (Recovery of) Income Tax and Income from Continuing Operations Before Income Tax (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2019
Income Tax Disclosure [Abstract]
Statutory Canadian tax rate	26.50%	26.50%	26.50%
Expected provision for (recovery of) income taxes from continuing operations	$ (295)	$ (39)	$ 20
Differences in income taxes resulting from:
Valuation allowance	205	41	(55)
Investment tax credits	(41)	(10)	(10)
Change in unrecognized income tax benefits	(48)	(12)	9
Foreign tax rate differences	3	3	(1)
Non-deductible permanent difference	13	15	19
Goodwill impairment	158	6	0
Other differences	(4)	1	2
Withholding Tax on Unremitted Earnings	0	(1)	0
Provision for (recovery of) income taxes	$ (9)	$ 4	$ (16)