Revenue and Segment Disclosures Revenue classified by timing of recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2019
Revenue classified by timing of recognition [Line Items]
Revenues	$ 893	$ 1,040	$ 904
Transferred over Time [Member]
Revenue classified by timing of recognition [Line Items]
Revenues	476	512	488
Transferred at Point in Time [Member]
Revenue classified by timing of recognition [Line Items]
Revenues	$ 417	$ 528	$ 416