CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Net revenues	$ 2,453	$ 2,550	$ 5,064	$ 5,270
Operating costs and expenses and other operating income:
Cost of services	1,611	1,565	3,257	3,191
Selling, general and administrative	422	429	847	836
Amortization of intangible assets	27	25	54	52
Other operating expense (income), net	5	(2)	5	(2)
Total operating costs and expenses, net	2,065	2,017	4,163	4,077
Operating income	388	533	901	1,193
Other income (expense):
Interest expense, net	(36)	(38)	(73)	(76)
Other (expense) income, net	(29)	322	(53)	326
Total non-operating (expense) income, net	(65)	284	(126)	250
Income before income taxes and equity in earnings of equity method investees	323	817	775	1,443
Income tax expense	(77)	(177)	(187)	(330)
Equity in earnings of equity method investees, net of taxes	4	10	35	27
Net income	250	650	623	1,140
Less: Net income attributable to noncontrolling interests	16	19	34	40
Net income attributable to Quest Diagnostics	$ 234	$ 631	$ 589	$ 1,100
Earnings per share attributable to Quest Diagnostics’ common stockholders:
Basic (in dollars per share)	$ 2.00	$ 5.05	$ 4.97	$ 8.52
Diluted (in dollars per share)	$ 1.96	$ 4.96	$ 4.88	$ 8.38
Basic (in Shares)	117	125	118	129
Diluted (in Shares)	119	127	120	131