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RELATED PARTIES	3 Months Ended
RELATED PARTIES	Mar. 31, 2021
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTIES The Company's equity method investees primarily consist of its clinical trials central laboratory services joint venture (see Note 14), a diagnostic information services joint venture, and an investment in a fund that purchases strategic holdings in private companies in the healthcare industry. During the three months ended March 31, 2021 and 2020, the Company recognized net revenues of $5 million and $9 million, respectively, associated with diagnostic information services provided to its equity method investees. As of March 31, 2021 and December 31, 2020, there was $5 million and $3 million, respectively, of accounts receivable from equity method investees related to such services. During the three months ended March 31, 2021 and 2020, the Company recognized income of $3 million and $4 million, respectively, associated with the performance of certain corporate services, including transition services, for its equity method investees, classified within selling, general and administrative expenses. As of March 31, 2021 and December 31, 2020, there was $1 million and $3 million, respectively, of other receivables from equity method investees included in prepaid expenses and other current assets related to these service agreements and other transition related items. In addition, accounts payable and accrued expenses as of both March 31, 2021 and December 31, 2020 included $1 million due to equity method investees. During the three months ended March 31, 2021 and 2020, the Company received dividends from its equity method investees of $16 million and $5 million, respectively.