CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Net revenues	$ 2,611	$ 2,720
Operating costs and expenses and other operating income:
Cost of services	1,646	1,626
Selling, general and administrative	425	407
Amortization of intangible assets	27	27
Total operating costs and expenses, net	2,098	2,060
Operating income	513	660
Other income (expense):
Interest expense, net	(37)	(38)
Other (expense) income, net	(24)	4
Total non-operating expense, net	(61)	(34)
Income before income taxes and equity in earnings of equity method investees	452	626
Income tax expense	(110)	(153)
Equity in earnings of equity method investees, net of taxes	31	17
Net income	373	490
Less: Net income attributable to noncontrolling interests	18	21
Net income attributable to Quest Diagnostics	$ 355	$ 469
Earnings per share attributable to Quest Diagnostics’ common stockholders:
Basic(in dollars per share)	$ 2.97	$ 3.52
Diluted (in dollars per share)	$ 2.92	$ 3.46
Weighted average common shares outstanding:
Basic (in Shares)	119	133
Diluted (in Shares)	121	135