CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Net revenues	$ 2,331	$ 2,611
Operating costs and expenses and other operating income:
Cost of services	1,560	1,646
Selling, general and administrative	439	425
Amortization of intangible assets	26	27
Other operating expense, net	1	0
Total operating costs and expenses, net	2,026	2,098
Operating income	305	513
Other income (expense):
Interest expense, net	(35)	(37)
Other income (expense), net	7	(24)
Total non-operating expense, net	(28)	(61)
Income before income taxes and equity in earnings of equity method investees	277	452
Income tax expense	(65)	(110)
Equity in earnings of equity method investees, net of taxes	5	31
Net income	217	373
Less: Net income attributable to noncontrolling interests	15	18
Net income attributable to Quest Diagnostics	$ 202	$ 355
Earnings per share attributable to Quest Diagnostics’ common stockholders:
Basic (in dollars per share)	$ 1.80	$ 2.97
Diluted (in dollars per share)	$ 1.78	$ 2.92
Weighted average common shares outstanding:
Basic (in Shares)	112	119
Diluted (in Shares)	113	121