Debentures - Impact of Changes in Fair Value of Debentures (Details) - USD ($) $ in Millions	3 Months Ended
	May 31, 2023	May 31, 2022
Debt Instrument [Line Items]
Income (charge) associated with the change in fair value from non-credit components recorded in the consolidated statements of operations	$ (22)	$ 46
Income (charge) associated with the change in fair value from instrument-specific credit components recorded in AOCL	0	2
Debenture total fair value adjustment	$ (22)	$ 48