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Convertible Senior Notes, Net (Tables)
6 Months Ended
Jul. 31, 2023
Debt Disclosure [Abstract]  
Schedule of Debt
The net carrying amount of the Notes consisted of the following:
As of July 31, 2023As of January 31, 2023
(dollars in millions)
2025 Notes:
Principal$552 $1,060 
Less: unamortized debt issuance costs(3)(8)
Net carrying amount$549 $1,052 
2026 Notes:
Principal$908 $1,150 
Less: unamortized debt issuance costs(6)(9)
Net carrying amount$902 $1,141 
Schedule of Carrying Amounts and Estimated Fair Values of Convertible Note
The following table presents the principal amounts and estimated fair values of the Notes, which are not recorded at fair value on the condensed consolidated balance sheets:
 As of July 31, 2023
 Principal Amount
Estimated Fair Value 
(dollars in millions)
2025 Notes$552 $502 
2026 Notes$908 $787