Revenue and Segment Disclosures -Transaction price allocated to the remaining performance obligations (Details) - USD ($) $ in Millions	3 Months Ended
	May 31, 2020	May 31, 2019
Transaction price allocated to the remaining performance obligations [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 386
Contract with Customer, Performance Obligation Satisfied in Previous Period	0	$ 0
Less than 12 months
Transaction price allocated to the remaining performance obligations [Line Items]
Revenue, Remaining Performance Obligation, Amount	264
12 to 24 months
Transaction price allocated to the remaining performance obligations [Line Items]
Revenue, Remaining Performance Obligation, Amount	90
After 24 months
Transaction price allocated to the remaining performance obligations [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 32