Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	May 31, 2020	May 31, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (636)	$ (35)
Other comprehensive income (loss)
Net changes in fair value and amounts reclassified to net loss from derivatives designated as cash flow hedges during the period, net of income taxes of nil (May 31, 2019 - income taxes of nil)	(1)	(1)
Foreign currency translation adjustment	1	(1)
Net change in fair value from instrument-specific credit risk on the Debentures, net of income taxes of $1 million (May 31, 2019 - income taxes of nil) (note 6)	7	(8)
Other comprehensive income (loss)	7	(10)
Comprehensive loss	$ (629)	$ (45)