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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Statement [Abstract]        
Net revenues $ 2,816 $ 2,488 $ 8,229 $ 7,251
Operating costs and expenses and other operating income:        
Cost of services 1,867 1,677 5,474 4,865
Selling, general and administrative 501 448 1,463 1,304
Amortization of intangible assets 39 32 117 90
Other operating expense, net 23 1 5 7
Total operating costs and expenses, net 2,430 2,158 7,059 6,266
Operating income 386 330 1,170 985
Other income (expense):        
Interest expense, net (66) (49) (200) (136)
Other income, net 8 15 18 27
Total non-operating expense, net (58) (34) (182) (109)
Income before income taxes and equity in earnings of equity method investees 328 296 988 876
Income tax expense (77) (65) (233) (205)
Equity in earnings of equity method investees, net of taxes 8 6 35 14
Net income 259 237 790 685
Less: Net income attributable to noncontrolling interests 14 11 43 36
Net income attributable to Quest Diagnostics $ 245 $ 226 $ 747 $ 649
Earnings per share attributable to Quest Diagnostics’ common stockholders:        
Basic (in dollars per share) $ 2.18 $ 2.01 $ 6.66 $ 5.80
Diluted (in dollars per share) $ 2.16 $ 1.99 $ 6.57 $ 5.74
Weighted average common shares outstanding:        
Basic (in Shares) 112 112 112 111
Diluted (in Shares) 113 113 113 112