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Quarterly Operating Results (unaudited) (Schedule) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Data [Abstract]                      
Net revenues $ 3,002 $ 2,786 $ 1,827 $ 1,822 $ 1,926 $ 1,956 $ 1,953 $ 1,891 $ 9,437 $ 7,726 $ 7,531
Gross profit 1,269 1,206 606 552 662 692 688 647 3,633 2,689  
Income from continuing operations 609 591 193 106 265 226 219 176 1,499 886 788
Income (loss) from discontinued operations, net of taxes 0 0 0 0 0 0 20 0 0 20 0
Net income 609 591 193 106 265 226 239 176 1,499 906 788
Less: net income attributable to noncontrolling interests 30 23 8 7 12 11 13 12 68 48 52
Net income attributable to Quest Diagnostics $ 579 $ 568 $ 185 $ 99 $ 253 $ 215 $ 226 $ 164 $ 1,431 $ 858 $ 736
Earnings per share attributable to Quest Diagnostics’ common stockholders - basic:                      
Income from continuing operations (in dollars per share) $ 4.28 $ 4.20 $ 1.38 $ 0.74 $ 1.88 $ 1.59 $ 1.52 $ 1.22 $ 10.62 $ 6.21 $ 5.39
Income from discontinued operations (in dollars per share) 0 0 0 0 0 0 0.15 0 0 0.15 0
Net income (in dollars per share) 4.28 4.20 1.38 0.74 1.88 1.59 1.67 1.22 10.62 6.36 5.39
Earnings per share attributable to Quest Diagnostics’ common stockholders - diluted:                      
Income from continuing operations (in dollars per share) 4.21 4.14 1.36 0.73 1.86 1.56 1.51 1.20 10.47 6.13 5.29
Income from discontinued operations (in dollars per share) 0 0 0 0 0 0 0.15 0 0 0.15 0
Net income (in dollars per share) $ 4.21 $ 4.14 $ 1.36 $ 0.73 $ 1.86 $ 1.56 $ 1.66 $ 1.20 $ 10.47 $ 6.28 $ 5.29