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Cash Equivalents and Investments
3 Months Ended
Apr. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Cash Equivalents and Investments Cash Equivalents and Investments
Cash Equivalents and Short-term Investments
In estimating fair value, the Company uses a three-tier fair value hierarchy as follows:
Level 1 — Valuations based on observable inputs that reflect quoted prices for identical assets or liabilities in active markets.
Level 2 — Valuations based on other inputs that are directly or indirectly observable in the marketplace.
Level 3 — Valuations based on unobservable inputs that are supported by little or no market activity.
The following tables present the amortized cost, unrealized gain (loss) and estimated fair value of cash equivalents and short-term investments:
 As of April 30, 2023
 
Amortized
Cost
Unrealized
Gain
Unrealized
Loss
Estimated
Fair Value 
(dollars in millions)
Level 1:
Cash equivalents:    
Money market funds$12 $— $— $12 
Total cash equivalents12 — — 12 
Level 2:
Short-term investments (Available-for-sale):
U.S. treasury securities2,155 (12)2,144 
Corporate debt securities102 — (1)101 
Total short-term investments2,257 (13)2,245 
Total$2,269 $$(13)$2,257 
 As of January 31, 2023
 
Amortized
Cost
Unrealized
Gain
Unrealized
Loss
Estimated
Fair Value 
(dollars in millions)
Level 1:
Cash equivalents:    
Money market funds$133 $— $— $133 
Total cash equivalents133 — — 133 
Level 2:
Short-term investments (Available-for-sale):
U.S. treasury securities2,207 — (22)2,185 
Corporate debt securities133 — (2)131 
Total short-term investments2,340 — (24)2,316 
Total$2,473 $— $(24)$2,449 

The following table presents the contractual maturities of the Company’s short-term investments:
As of April 30, 2023
 
Amortized
Cost
Estimated
Fair Value
(dollars in millions)
Due within one year$1,960 $1,949 
Due between one to five years297 296 
 Total$2,257 $2,245 
Interest receivable of $15 million and $10 million is included in Prepaid expenses and other current assets on the condensed consolidated balance sheets as of April 30, 2023 and January 31, 2023, respectively.
The following table presents the fair values and unrealized losses related to the Company’s investments in available-for-sale debt securities classified by length of time that the securities have been in a continuous unrealized loss position as of April 30, 2023:

 Less Than 12 MonthsMore Than 12 MonthsTotal
 
Estimated Fair Value
Unrealized
Losses
Estimated Fair Value
Unrealized
Losses
Estimated Fair Value
Unrealized
Losses
(dollars in millions)
U.S. treasury securities$1,212 $(4)$679 $(8)$1,891 $(12)
Corporate debt securities— — 83 (1)83 (1)
Total$1,212 $(4)$762 $(9)$1,974 $(13)
The Company had 139 and 159 short-term investments in unrealized loss positions as of April 30, 2023 and January 31, 2023, respectively.
For available-for-sale debt securities that have unrealized losses, the Company evaluates whether (i) the Company has the intention to sell any of these investments, (ii) it is not more likely than not that the Company will be required to sell any of these available-for-sale debt securities before recovery of the entire amortized cost basis and (iii) the decline in the fair value of the investment is due to credit or non-credit related factors. There were no material credit or non-credit related impairments for short-term investments as of April 30, 2023 and January 31, 2023.
Strategic Investments
Strategic investments primarily include equity investments in privately-held companies, which do not have a readily determinable fair value. As of April 30, 2023 and January 31, 2023, the balance of strategic investments was $26 million and $25 million, respectively.