CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 217	$ 373
Other comprehensive income (loss):
Foreign currency translation adjustment	3	(2)
Other comprehensive income (loss)	3	(2)
Comprehensive income	220	371
Less: Comprehensive income attributable to noncontrolling interests	15	18
Comprehensive income attributable to Quest Diagnostics	$ 205	$ 353