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FAIR VALUE MEASUREMENTS
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS
    Assets and Liabilities Measured at Fair Value on a Recurring Basis

    The following table provides a summary of the recognized assets and liabilities that are measured at fair value on a recurring basis:
Basis of Fair Value Measurements
Quoted Prices in Active Markets for Identical Assets/LiabilitiesSignificant Other Observable InputsSignificant Unobservable Inputs
September 30, 2021TotalLevel 1Level 2Level 3
Assets:    
Deferred compensation trading securities$75 $75 $— $— 
Cash surrender value of life insurance policies54 — 54 — 
Equity investments49 49 — — 
Available-for-sale debt securities— — 
Total$179 $124 $54 $
Liabilities:    
Deferred compensation liabilities$139 $— $139 $— 
Redeemable noncontrolling interest$79 $— $— $79 
Basis of Fair Value Measurements
December 31, 2020TotalLevel 1Level 2Level 3
Assets:       
Deferred compensation trading securities$67 $67 $— $— 
Cash surrender value of life insurance policies50 — 50 — 
Available-for-sale debt securities12 — — 12 
Total$129 $67 $50 $12 
Liabilities:    
Deferred compensation liabilities$126 $— $126 $— 
Redeemable noncontrolling interest$82 $— $— $82 
    
    A detailed description regarding the Company's fair value measurements is contained in Note 7 to the audited consolidated financial statements in the Company's 2020 Annual Report on Form 10-K.    

    The Company offers certain employees the opportunity to participate in a non-qualified supplemental deferred compensation plan. A participant's deferrals, together with Company matching credits, are invested in a variety of participant-directed investment options that are classified as trading securities. These trading securities are classified within Level 1 of the fair value hierarchy because the changes in the fair value of these securities are measured using quoted prices in active markets based on the market price per unit multiplied by the number of units held, exclusive of any transaction costs. A corresponding adjustment for changes in fair value of the trading securities is also reflected in the changes in fair value of the deferred compensation obligation. The deferred compensation liabilities are classified within Level 2 of the fair value hierarchy because their inputs are derived principally from observable market data by correlation to the trading securities.
    The Company offers certain employees the opportunity to participate in a non-qualified deferred compensation program. A participant's deferrals, together with Company matching credits, are “invested” at the direction of the employee in a hypothetical portfolio of investments which are tracked by an administrator. The Company purchases life insurance policies, with the Company named as beneficiary of the policies, for the purpose of funding the program's liability. Changes in the cash surrender value of the life insurance policies are based upon earnings and changes in the value of the underlying investments. Changes in the fair value of the deferred compensation obligation are derived using quoted prices in active markets based on the market price per unit multiplied by the number of units. The cash surrender value and the deferred compensation obligation are classified within Level 2 of the fair value hierarchy because their inputs are derived principally from observable market data by correlation to the hypothetical investments. Deferrals under the plan currently may only be made by participants who made deferrals under the plan in 2017.

    The Company's investment portfolio primarily includes equity investments comprised mostly of strategic holdings in companies concentrated in the life sciences and healthcare industries. Equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) with readily determinable fair values are measured at fair value in prepaid expenses and other current assets in the Company's consolidated balance sheet. Equity investments that do not have readily determinable fair values (which consist of investments in preferred and common shares of private companies) are measured at cost minus impairment, if any, plus or minus changes resulting from observable price changes. During the three months ended September 30, 2021, certain of the Company's equity investments became publicly-traded and, based on the readily determinable fair values, the Company recognized gains of $42 million in other income, net in the Company's consolidated statement of operations. Such equity investments are now classified within Level 1 of the fair value hierarchy because the changes in the fair values of the securities are measured using quoted prices in active markets based on the market price per share multiplied by the number of shares held, exclusive of any transaction costs.

    The Company's available-for-sale debt securities are measured at fair value based on estimated future cash flows. These fair value measurements are classified within Level 3 of the fair value hierarchy as the fair value is based on significant inputs that are not observable, including cash flow projections.
        
    In connection with the sale of an 18.9% noncontrolling interest in a subsidiary to UMass Memorial Medical Center ("UMass") on July 1, 2015, the Company granted UMass the right to require the Company to purchase all of its interest in the subsidiary at fair value commencing July 1, 2020. As of September 30, 2021, the redeemable noncontrolling interest was presented at its fair value. The fair value measurement of the redeemable noncontrolling interest is classified within Level 3 of the fair value hierarchy because the fair value is based on a discounted cash flow analysis that takes into account, among other items, the joint venture's expected future cash flows, long term growth rates, and a discount rate commensurate with economic risk.

    During the nine months ended September 30, 2021, the Company recorded an $8 million impairment charge, which is included in equity in earnings of equity method investees, net of taxes, in order to adjust to fair value an investment that is accounted for under the equity method of accounting. Following the impairment charge, the carrying value of the investment is not material. The fair value measurement was classified within Level 3 of the fair value hierarchy as it was based on significant inputs that are not observable, including cash flow projections.
    
    The carrying amounts of cash and cash equivalents, accounts receivable, and accounts payable and accrued expenses approximate fair value based on the short maturities of these instruments. As of September 30, 2021 and December 31, 2020, the fair value of the Company’s debt was estimated at $4.5 billion and $4.6 billion, respectively. Principally all of the Company's debt is classified within Level 1 of the fair value hierarchy because the fair value of the debt is estimated based on rates currently offered to the Company with identical terms and maturities, using quoted active market prices and yields, taking into account the underlying terms of the debt instruments.