Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Feb. 28, 2021	Feb. 29, 2020
Assets
Property, plant, equipment and intangibles assets	$ 240	$ 174
Non-deductible reserves	59	65
Minimum Taxes	206	267
Convertible Debentures (note 7)	94	1
Research and development	390	327
Tax loss carryforwards	414	419
Other tax carryforwards	82	117
Deferred Tax Assets, Gross	1,485	1,370
Valuation allowance	1,360	1,223
Deferred income tax assets	125	147
Liabilities
Property, plant and equipment	(125)	(147)
Deferred income tax liabilities	125	147
Net deferred income tax asset (liability)	$ 0	$ 0