Item 3. Quantitative and Qualitative Disclosures About Market Risk.

INVESTMENTS AND DEBT

As of September 30, 2023, we had short-term investments of $2.2 billion and long-term investments of $16.6 billion, including restricted deposits of $1.3 billion. The short-term investments generally consist of highly liquid securities with maturities between three and 12 months. The long-term investments consist of municipal, corporate and U.S. Treasury securities, government-sponsored obligations, life insurance contracts, asset-backed securities, and equity securities, and have maturities greater than one year. Restricted deposits consist of investments required by various state statutes to be deposited or pledged to state agencies. Due to the nature of the states' requirements, these investments are classified as long-term regardless of the contractual maturity date. Substantially all of our investments are subject to interest rate risk and will decrease in value if market rates increase. Assuming a hypothetical and immediate 1% increase in market interest rates at September 30, 2023, the fair value of our fixed income investments would decrease by approximately $601 million.

We have a foreign currency swap for a notional amount of $931 million with a creditworthy financial institution to manage foreign exchange risk related to the pending Circle Health divestiture. As a result, the fair value of the swap varies with foreign exchange rate fluctuations. Assuming a 1% increase in the Great British Pound to US Dollar foreign exchange rate at September 30, 2023, the fair value of our swap would decrease by approximately $9 million. An increase in the US Dollar to Great British Pound foreign exchange rate decreases the fair value of the swap and conversely, a decrease in the foreign currency exchange rate increases the value. We do not hold or issue any derivative instruments for trading or speculative purposes.

For a discussion of the interest rate risk that our investments are subject to, refer to our 10-K for the fiscal year ended December 31, 2022, Part 1, Item 1A, "Risk Factors – Our investment portfolio may suffer losses which could materially and adversely affect our results of operations or liquidity."