CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 208	$ 217
Other comprehensive income (loss):
Foreign currency translation adjustment	(2)	3
Other comprehensive (loss) income	(2)	3
Comprehensive income	206	220
Less: Comprehensive income attributable to noncontrolling interests	14	15
Comprehensive income attributable to Quest Diagnostics	$ 192	$ 205