CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Net revenues	$ 2,486	$ 2,774	$ 7,550	$ 8,044
Operating costs and expenses and other operating income:
Cost of services	1,618	1,670	4,875	4,861
Selling, general and administrative	464	427	1,311	1,263
Amortization of intangible assets	27	25	81	77
Other operating income, net	(15)	0	(10)	(2)
Total operating costs and expenses, net	2,094	2,122	6,257	6,199
Operating income	392	652	1,293	1,845
Other income (expense):
Interest expense, net	(33)	(38)	(106)	(114)
Other (expense) income, net	(8)	40	(61)	366
Total non-operating (expense) income, net	(41)	2	(167)	252
Income before income taxes and equity in earnings of equity method investees	351	654	1,126	2,097
Income tax expense	(81)	(153)	(268)	(483)
Equity in earnings of equity method investees, net of taxes	6	26	41	53
Net income	276	527	899	1,667
Less: Net income attributable to noncontrolling interests	20	22	54	62
Net income attributable to Quest Diagnostics	$ 256	$ 505	$ 845	$ 1,605
Earnings per share attributable to Quest Diagnostics’ common stockholders:
Basic (in dollars per share)	$ 2.20	$ 4.11	$ 7.17	$ 12.63
Diluted (in dollars per share)	$ 2.17	$ 4.02	$ 7.05	$ 12.41
Basic (in Shares)	116	123	117	127
Diluted (in Shares)	118	125	119	129