CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Net revenues	$ 9,883	$ 10,788	$ 9,437
Operating costs and expenses and other operating income:
Cost of services	6,450	6,579	5,804
Selling, general and administrative	1,874	1,727	1,550
Amortization of intangible assets	120	103	103
Other operating expense (income), net	11	(2)	9
Total operating costs and expenses, net	8,455	8,407	7,466
Operating income	1,428	2,381	1,971
Other income (expense):
Interest expense, net	(138)	(151)	(163)
Other (expense) income, net	(55)	369	76
Total non-operating (expense) income, net	(193)	218	(87)
Income before income taxes and equity in earnings of equity method investees	1,235	2,599	1,884
Income tax expense	(264)	(597)	(460)
Equity in earnings of equity method investees, net of taxes	44	78	75
Net income	1,015	2,080	1,499
Less: Net income attributable to noncontrolling interests	69	85	68
Net income attributable to Quest Diagnostics	$ 946	$ 1,995	$ 1,431
Earnings per share attributable to Quest Diagnostics’ common stockholders:
Basic (in dollars per share)	$ 8.10	$ 15.85	$ 10.62
Diluted (in dollars per share)	$ 7.97	$ 15.55	$ 10.47