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Convertible Senior Notes, Net (Tables) | 12 Months Ended
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Jan. 31, 2023
Debt Disclosure [Abstract] |
Schedule of Convertible Debt | The net carrying amount of the 2023 Notes consisted of the following:
| As of January 31, 2023 |  | As of January 31, 2022
| (dollars in millions)
Liability component: |  |  |
Principal | $ | — |  |  | $ | 17 |
Less: unamortized debt issuance costs and debt discount(1) | — |  |  | (1) |
Net carrying amount | $ | — |  |  | $ | 16 |
Equity component:(1) |  |  |
2023 Notes | $ | — |  |  | $ | 4 |
Less: issuance costs | — |  |  | — |
Carrying amount of the equity component(2) | $ | — |  |  | $ | 4 |
(1) Subsequent to the adoption of ASU 2020-06 under the modified retrospective method, the equity component and debt discount are eliminated. (2) Included in the January 31, 2022 consolidated balance sheet within Additional paid-in capital. The net carrying amount of the 2025 Notes consisted of the following:
| As of January 31, 2023 |  | As of January 31, 2022
| (dollars in millions)
Liability component: |  |  |
Principal | $ | 1,060 |  |  | $ | 1,060 |
Less: unamortized debt issuance costs and debt discount(1) | (8) |  |  | (149) |
Net carrying amount | $ | 1,052 |  |  | $ | 911 |
Equity component:(1) |  |  |
2025 Notes | $ | — |  |  | $ | 221 |
Less: issuance costs | — |  |  | (4) |
Carrying amount of the equity component(2) | $ | — |  |  | $ | 217 |
(1) Subsequent to the adoption of ASU 2020-06 under the modified retrospective method, the equity component and debt discount are eliminated. (2) Included in the January 31, 2022 consolidated balance sheet within Additional paid-in capital. The net carrying amount of the 2026 Notes consisted of the following:
| As of January 31, 2023 |  | As of January 31, 2022
| (dollars in millions)
Liability component: |  |  |
Principal | $ | 1,150 |  |  | $ | 1,150 |
Less: unamortized debt issuance costs and debt discount(1) | (9) |  |  | (245) |
Net carrying amount | $ | 1,141 |  |  | $ | 905 |
Equity component:(1) |  |  |
2026 Notes | $ | — |  |  | $ | 310 |
Less: issuance costs | — |  |  | (4) |
Carrying amount of the equity component(2) | $ | — |  |  | $ | 306 |
(1) Subsequent to the adoption of ASU 2020-06 under the modified retrospective method, the equity component and debt discount are eliminated. (2) Included in the January 31, 2022 consolidated balance sheet within Additional paid-in capital.
Schedule of Interest Expense | The following table sets forth total interest expense recognized related to the 2025 Notes:
| Year Ended January 31, |  |
| 2023 |  | 2022 |  | 2021 |  |
| (dollars in millions) |  |
Contractual interest expense | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  |
Amortization of debt issuance costs | 3 |  |  | 2 |  |  | 2 |  |  |
Amortization of debt discount(1) | — |  |  | 36 |  |  | 34 |  |  |
Total | $ | 4 |  |  | $ | 39 |  |  | $ | 37 |  |  |
(1) Not applicable subsequent to the adoption of ASU 2020-06.The following table sets forth total interest expense recognized related to the 2026 Notes:
|  | Year Ended January 31, |  |
|  |  |  | 2023 |  | 2022 |  | 2021 |  |
|  |  |  | (dollars in millions) |  |
Contractual interest expense |  |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | 3 |  |  |
Amortization of debt issuance costs |  |  |  | 3 |  |  | 1 |  |  | 1 |  |  |
Amortization of debt discount(1) |  |  |  | — |  |  | 46 |  |  | 27 |  |  |
Total |  |  |  | $ | 7 |  |  | $ | 51 |  |  | $ | 31 |  |  |
(1) Not applicable subsequent to the adoption of ASU 2020-06.

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- Definition Tabular disclosure of convertible debt instrument. Includes, but is not limited to, principal amount and amortized premium or discount. + References No definition available. + Details
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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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