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Fair Value Measurements
 3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements We generally 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 2020 Annual Report on Form 10-K, Note 5, “Fair Value Measurements.”
Our financial instruments measured at fair value on a recurring basis at March 31, 2021, were as follows:
Observable InputsDirectly or Indirectly Observable InputsUnobservable Inputs
Total(Level 1) (Level 2) (Level 3)
 (In millions)
Corporate debt securities$1,188 $— $1,188 $— 
Mortgage-backed securities429 — 429 — 
Asset-backed securities152 — 152 — 
U.S. Treasury notes97 — 97 — 
Municipal securities72 — 72 — 
Total assets$1,938 $— $1,938 $— 
Contingent consideration liabilities$31 $— $— $31 
Total liabilities$31 $— $— $31 
Our financial instruments measured at fair value on a recurring basis at December 31, 2020, were as follows:
Observable InputsDirectly or Indirectly Observable InputsUnobservable Inputs
Total(Level 1)(Level 2)(Level 3)
 (In millions)
Corporate debt securities$1,256 $— $1,256 $— 
Mortgage-backed securities392 — 392 — 
Asset-backed securities132 — 132 — 
U.S. Treasury notes27 — 27 — 
Municipal securities68 — 68 — 
Total assets $1,875 $— $1,875 $— 
Contingent consideration liabilities $46 $— $— $46 
Total liabilities$46 $— $— $46 
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 first quarter of 2021, we recognized a loss of $8 million for the increase in the fair value of the contingent consideration liabilities described below.
Contingent Consideration Liabilities
As of March 31, 2021, our Level 3 financial instruments recorded at fair value on a recurring basis included contingent consideration liabilities of $31 million, in connection with our 2020 acquisition of certain assets of Passport Health Plan, Inc., a Medicaid health plan in Kentucky. In the first quarter of 2021, the contingent purchase consideration relating to 2021 member enrollment was finalized and half the consideration due, or $23 million, was paid to the seller. We expect to pay the remaining balance of the liabilities, reported in “Accounts payable, accrued liabilities and other” in the accompanying consolidated balance sheets, later in 2021 and in the first quarter of 2022. The portion of the contingent purchase consideration paid in the first quarter 2021 has been presented primarily in “Financing activities” in the accompanying consolidated statements of cash flows, with the balance reflected in “Operating activities.”
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.
 March 31, 2021December 31, 2020
 Carrying
Amount		Fair Value Carrying
Amount		Fair Value
 (In millions)
4.375% Notes
$790 $822 $789 $843 
5.375% Notes
697 736 697 742 
3.875% Notes
641 665 641 691 
Total$2,128 $2,223 $2,127 $2,276