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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Statement [Abstract]    
Net revenues $ 1,822 $ 1,891
Operating costs and expenses and other operating income:    
Cost of services 1,270 1,244
Selling, general and administrative 347 384
Amortization of intangible assets 25 24
Other operating expense (income), net 5 (9)
Total operating costs and expenses, net 1,647 1,643
Operating income 175 248
Other income (expense):    
Interest expense, net (41) (44)
Other (expense) income, net (16) 9
Total non-operating expenses, net (57) (35)
Income before income taxes and equity in earnings of equity method investees 118 213
Income tax expense (26) (50)
Equity in earnings of equity method investees, net of taxes 14 13
Net income 106 176
Less: Net income attributable to noncontrolling interests 7 12
Net income attributable to Quest Diagnostics $ 99 $ 164
Earnings per share attributable to Quest Diagnostics’ common stockholders:    
Basic (in dollars per share) $ 0.74 $ 1.22
Diluted (in dollars per share) $ 0.73 $ 1.20
Weighted average common shares outstanding:    
Basic (in Shares) 134 134
Diluted (in Shares) 135 136