CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 276	$ 527	$ 899	$ 1,667
Other comprehensive income (loss):
Foreign currency translation adjustment	(8)	(4)	(17)	14
Net change in available-for-sale debt securities, net of taxes	0	0	0	(7)
Net deferred gain on cash flow hedges, net of taxes	0	1	0	1
Other comprehensive (loss) income	(8)	(3)	(17)	8
Comprehensive income	268	524	882	1,675
Less: Comprehensive income attributable to noncontrolling interests	20	22	54	62
Comprehensive income attributable to Quest Diagnostics	$ 248	$ 502	$ 828	$ 1,613