Debentures - Impact of Changes in Fair Value of Debentures (Details) - USD ($)
$ in Millions |
3 Months Ended |
9 Months Ended |
Nov. 30, 2020 |
Nov. 30, 2019 |
Nov. 30, 2020 |
Nov. 30, 2019 |
| Debt Instrument [Line Items] |
|
|
|
|
| Income (charge) associated with the change in fair value from non-credit components recorded in the consolidated statements of operations |
$ (95)
|
$ 20
|
$ (114)
|
$ 71
|
| 3.75% Debenture |
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
| Income (charge) associated with the change in fair value from non-credit components recorded in the consolidated statements of operations |
0
|
20
|
(19)
|
71
|
| Income (charge) associated with the change in fair value from instrument-specific credit components recorded in AOCL |
0
|
(2)
|
15
|
(15)
|
| Realized charges associated with the change in fair value from credit components recorded in the consolidated statement of operations on redemption |
(6)
|
0
|
(6)
|
0
|
| Realized charges associated with the change in fair value from credit components released from AOCL on redemption |
6
|
0
|
6
|
0
|
| Debenture total fair value adjustment |
0
|
18
|
(4)
|
56
|
| 1.75% Debenture |
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
| Income (charge) associated with the change in fair value from non-credit components recorded in the consolidated statements of operations |
(89)
|
0
|
(89)
|
0
|
| Income (charge) associated with the change in fair value from instrument-specific credit components recorded in AOCL |
(5)
|
0
|
(5)
|
0
|
| Debenture total fair value adjustment |
$ (94)
|
$ 0
|
$ (94)
|
$ 0
|