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Leases (Future Minimum Payments - under ASC 84) (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Leases [Abstract]    
2020 $ 36  
2021 28  
2022 27  
2023 27  
2024 20  
Thereafter 47  
Total 185  
Rental expense incurred $ 31 $ 32