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Fair Value Measurements
 12 Months Ended
Dec. 31, 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 a three-tier fair value hierarchy as follows:
Level 1 — Observable Inputs. Level 1 financial instruments are actively traded and therefore the fair value for these securities is based on quoted market prices for identical securities in active markets.
Level 2 — Directly or Indirectly Observable Inputs. Fair value for these investments is determined using a market approach based on quoted prices for similar securities in active markets or quoted prices for identical securities in inactive markets.
Level 3 — Unobservable Inputs. Level 3 financial instruments are valued using unobservable inputs that represent management’s best estimate of what market participants would use in pricing the financial instrument at the measurement date. As of December 31, 2022, our Level 3 financial instruments consisted of contingent consideration liabilities.
Our financial instruments measured at fair value on a recurring basis at December 31, 2023, were as follows:
TotalLevel 1Level 2Level 3
 (In millions)
Corporate debt securities$2,732 $— $2,732 $— 
Mortgage-backed securities911 — 911 — 
Asset-backed securities365 — 365 — 
Municipal securities166 — 166 — 
U.S. Treasury notes40 — 40 — 
Other
45 — 45 — 
Total assets$4,259 $— $4,259 $— 
Our financial instruments measured at fair value on a recurring basis at December 31, 2022, were as follows:
TotalLevel 1Level 2Level 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$8 $— $— $8 
Total liabilities$8 $— $— $8 
Level 3 Contingent Consideration Liabilities
The net changes in fair value of Level 3 financial instruments are reported in “Other” operating expenses in our consolidated statements of income. In the year ended December 31, 2022, we recognized a loss of $4 million, primarily for the increase in the fair value of the contingent consideration liability described below.
In the year ended December 31, 2023, we paid the seller $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 year ended December 31, 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.
 December 31, 2023December 31, 2022
 Carrying
Amount		Fair Value Carrying
Amount		Fair Value
 (In millions)
4.375% Notes due 2028
$794 $757 $792 $729 
3.875% Notes due 2030
644 583 643 554 
3.875% Notes due 2032
742 654 741 629 
Total$2,180 $1,994 $2,176 $1,912