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Fair Value Measurements
9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements We consider the carrying amounts of current assets and current liabilities to approximate their fair values because of the relatively short period of time between the origination of these instruments and their expected realization or payment. For our financial instruments measured at fair value on a recurring basis, we prioritize the inputs used in measuring fair value according to the three-tier fair value hierarchy. For a description of the methods and assumptions used to: a) estimate the fair value; and b) determine the classification according to the fair value hierarchy for each financial instrument, refer to our 2022 Annual Report on Form 10-K, Note 5, “Fair Value Measurements.”
Our financial instruments measured at fair value on a recurring basis at September 30, 2023, were as follows:
Observable InputsDirectly or Indirectly Observable InputsUnobservable Inputs
Total(Level 1) (Level 2) (Level 3)
 (In millions)
Corporate debt securities$2,619 $— $2,619 $— 
Mortgage-backed securities888 — 888 — 
Asset-backed securities361 — 361 — 
Municipal securities149 — 149 — 
U.S. Treasury notes51 — 51 — 
Other
43 — 43 — 
Total assets$4,111 $— $4,111 $— 
Our financial instruments measured at fair value on a recurring basis at December 31, 2022, were as follows:
Observable InputsDirectly or Indirectly Observable InputsUnobservable Inputs
Total(Level 1)(Level 2)(Level 3)
 (In millions)
Corporate debt securities$2,184 $— $2,184 $— 
Mortgage-backed securities731 — 731 — 
Asset-backed securities288 — 288 — 
Municipal securities149 — 149 — 
U.S. Treasury notes105 — 105 — 
Other
42 — 42 — 
Total assets $3,499 $— $3,499 $— 
Contingent consideration liabilities $$— $— $
Total liabilities$$— $— $
Contingent Consideration Liabilities
In the nine months ended September 30, 2023, we paid $8 million in connection with our 2020 acquisition of certain assets of Passport Health Plan, Inc., which represented the final payment of the consideration due relating to an operating income guarantee. The amount paid in the nine months ended September 30, 2023, has been presented in “Operating activities” in the accompanying consolidated statements of cash flows.
Fair Value Measurements – Disclosure Only
The carrying amounts and estimated fair values of our notes payable are classified as Level 2 financial instruments. Fair value for these securities is determined using a market approach based on quoted market prices for similar securities in active markets or quoted prices for identical securities in inactive markets.
 September 30, 2023December 31, 2022
 Carrying
Amount
Fair Value Carrying
Amount
Fair Value
 (In millions)
4.375% Notes due 2028
$793 $715 $792 $729 
3.875% Notes due 2030
644 537 643 554 
3.875% Notes due 2032
742 601 741 629 
Total$2,179 $1,853 $2,176 $1,912