CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 921	$ 908	$ 1,015
Other comprehensive income (loss):
Foreign currency translation adjustment	(76)	5	(8)
Net deferred gains on cash flow hedges, net of taxes	2	2	1
Other comprehensive (loss) income	(74)	7	(7)
Comprehensive income	847	915	1,008
Less: Comprehensive income attributable to noncontrolling interests	50	54	69
Comprehensive income attributable to Quest Diagnostics	$ 797	$ 861	$ 939