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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]        
Net revenues $ 1,931 $ 1,885 $ 5,773 $ 5,654
Operating costs and expenses and other operating income:        
Cost of services 1,190 1,157 3,525 3,456
Selling, general and administrative 423 409 1,297 1,281
Amortization of intangible assets 19 18 54 54
Gain on disposition of business 0 0 0 (118)
Other operating expense (income), net 1 (21) 1 (20)
Total operating costs and expenses, net 1,633 1,563 4,877 4,653
Operating income 298 322 896 1,001
Other income (expense):        
Interest expense, net (38) (37) (112) (107)
Other (expense) income, net (2) 4 12 (50)
Total non-operating expenses, net (40) (33) (100) (157)
Income before income taxes and equity in earnings of equity method investees 258 289 796 844
Income tax expense (92) (95) (264) (345)
Equity in earnings of equity method investees, net of taxes 9 11 25 30
Net income 175 205 557 529
Less: Net income attributable to noncontrolling interests 14 13 39 39
Net income attributable to Quest Diagnostics $ 161 $ 192 $ 518 $ 490
Earnings per share attributable to Quest Diagnostics’ common stockholders:        
Basic (per share) $ 1.18 $ 1.37 $ 3.77 $ 3.46
Diluted (per share) $ 1.15 $ 1.34 $ 3.68 $ 3.42
Weighted average common shares outstanding:        
Basic (in Shares) 137 139 137 141
Diluted (in Shares) 140 142 140 143
Dividends per common share $ 0.45 $ 0.40 $ 1.35 $ 1.20