CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 250	$ 650	$ 623	$ 1,140
Other comprehensive income (loss):
Foreign currency translation adjustment	(7)	21	(9)	18
Net change in available-for-sale debt securities, net of taxes	0	0	0	(7)
Other comprehensive (loss) income	(7)	21	(9)	11
Comprehensive income	243	671	614	1,151
Less: Comprehensive income attributable to noncontrolling interests	16	19	34	40
Comprehensive income attributable to Quest Diagnostics	$ 227	$ 652	$ 580	$ 1,111