Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent Presented in the Consolidated Statements of Cash Flow (Details) - USD ($) $ in Millions	May 31, 2020	Feb. 29, 2020	May 31, 2019	Feb. 28, 2019
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents (note 3)	$ 312	$ 377
Restricted cash and cash equivalents	48	49
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Total	$ 360	$ 426	$ 391	$ 582