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Investments
 9 Months Ended
Sep. 30, 2024
Investments [Abstract]  
Investments
Our investments were as follows:
(in millions)September 30, 2024December 31, 2023
Short-term investments:
Equity investment security$11 $11 
Held-to-maturity investment securities— 3 
Time deposits1 — 
Total short-term investments$12 $14 
Long-term investments:
Other investments$90 $80 
Restricted time deposits(1)
— 355 
Total long-term investments$90 $435 
(1)As of December 31, 2023 the balance of restricted time deposits contained $96 million of restricted cash equivalents. See Note 8.
Equity Investment Security
Our equity investment security is a U.S. dollar denominated investment in a fixed income mutual fund. Realized and unrealized gains and losses were immaterial for the three and nine months ended September 30, 2024 and 2023.
Held-to-Maturity Investment Securities
As of September 30, 2024, we had no held-to-maturity securities. As of December 31, 2023, the amortized cost and fair value of the held-to-maturity investments were each $3 million. Our held-to-maturity investment securities consisted of an Indian rupee denominated investment in commercial paper, which was in an unrealized loss position, but had not been in an unrealized loss position for longer than 12 months.
Other Investments
As of September 30, 2024 and December 31, 2023, we had an equity method investment of $84 million and $74 million, respectively, in the technology sector. Additionally, as of each of September 30, 2024 and December 31, 2023, we had equity securities without a readily determinable fair value of $6 million.