Revenue and Segment Disclosures -Transaction price allocated to the remaining performance obligations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2021	Aug. 31, 2020
Transaction price allocated to the remaining performance obligations [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 264		$ 264
Contract with Customer, Performance Obligation Satisfied in Previous Period	0	$ 0	0	$ 1
Less than 12 months
Transaction price allocated to the remaining performance obligations [Line Items]
Revenue, Remaining Performance Obligation, Amount	213		213
12 to 24 months
Transaction price allocated to the remaining performance obligations [Line Items]
Revenue, Remaining Performance Obligation, Amount	36		36
After 24 months
Transaction price allocated to the remaining performance obligations [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 15		$ 15