Debentures - Impact of Changes in Fair Value of Debentures (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 29, 2024	Feb. 28, 2023	Feb. 28, 2022
Debt Instrument [Line Items]
Income associated with the change in fair value from non-credit components recorded in the consolidated statements of operations	$ (3)	$ 138	$ 212
Income associated with the change in fair value from instrument-specific credit components recorded in AOCL	0
2020 Debentures
Debt Instrument [Line Items]
Income associated with the change in fair value from non-credit components recorded in the consolidated statements of operations	2	138	212
Income associated with the change in fair value from instrument-specific credit components recorded in AOCL		2	1
Realized losses associated with the change in fair value from credit components recorded in the consolidated statements of operations on maturity of the Extension Debentures and 2020 Debentures	(6)	0	0
Realized losses associated with the change in fair value from credit components released from AOCL on maturity of the Extension Debentures and 2020 Debentures	(6)	0	0
Debenture total fair value adjustment	$ 2	$ 140	$ 213