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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]      
Net revenues $ 9,437 $ 7,726 $ 7,531
Operating costs and expenses and other operating expense (income):      
Cost of services 5,804 5,037 4,926
Selling, general and administrative 1,550 1,457 1,424
Amortization of intangible assets 103 96 90
Other operating expense (income), net 9 (95) (10)
Total operating costs and expenses, net 7,466 6,495 6,430
Operating income 1,971 1,231 1,101
Other income (expense):      
Interest expense, net (163) (175) (167)
Other income (expense), net 76 20 (8)
Total non-operating expenses, net (87) (155) (175)
Income from continuing operations before income taxes and equity in earnings of equity method investees 1,884 1,076 926
Income tax expense (460) (247) (182)
Equity in earnings of equity method investees, net of taxes 75 57 44
Income from continuing operations 1,499 886 788
Income from discontinued operations, net of taxes 0 20 0
Net income 1,499 906 788
Less: Net income attributable to noncontrolling interests 68 48 52
Net income attributable to Quest Diagnostics 1,431 858 736
Amounts attributable to Quest Diagnostics’ common stockholders:      
Income from continuing operations 1,431 838 736
Income from discontinued operations, net of taxes 0 20 0
Net income attributable to Quest Diagnostics $ 1,431 $ 858 $ 736
Earnings per share attributable to Quest Diagnostics’ common stockholders - basic:      
Income from continuing operations (in dollars per share) $ 10.62 $ 6.21 $ 5.39
Income from discontinued operations (in dollars per share) 0 0.15 0
Net income (in dollars per share) 10.62 6.36 5.39
Earnings per share attributable to Quest Diagnostics’ common stockholders - diluted:      
Income from continuing operations (in dollars per share) 10.47 6.13 5.29
Income from discontinued operations (in dollars per share) 0 0.15 0
Net income (in dollars per share) $ 10.47 $ 6.28 $ 5.29