Debentures - Change in Fair Value (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Debt Instrument [Line Items]
Debenture, Fair Value, beginning balance			$ 720
Debenture, Fair Value, ending balance	$ 673		673
1.75% Debenture
Debt Instrument [Line Items]
Debenture, Fair Value, beginning balance			720
Debenture total fair value adjustment	(109)	$ 94	(47)	$ 94
Debenture, Fair Value, ending balance	673		673
3.75% Debenture
Debt Instrument [Line Items]
Debenture total fair value adjustment	$ 0	$ 0	$ 0	$ 4