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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 1) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net revenues $ 1,839 $ 1,889 $ 1,919 $ 1,884 $ 1,865 $ 1,856 $ 1,864 $ 1,817 $ 7,531 $ 7,402 $ 7,214
Selling, general and administrative expenses                 1,424 1,443 1,380
Net income attributable to Quest Diagnostics 127 $ 213 $ 219 $ 177 254 $ 161 $ 193 $ 164 736 772 645
Provision for doubtful accounts                 6 8 7
Accounts receivable                 (65) 9 (42)
Accounts receivable         937         937  
Allowance for doubtful accounts 15       13       15 13  
Accounts receivable, net of allowance for doubtful accounts $ 1,012       924       $ 1,012 924  
Adjustments for New Accounting Pronouncement [Member] | As Reported [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net revenues                   7,709 7,515
Selling, general and administrative expenses                   1,750 1,681
Net income attributable to Quest Diagnostics                   772 645
Provision for doubtful accounts                   315 308
Accounts receivable                   (298) (343)
Accounts receivable         1,193         1,193  
Allowance for doubtful accounts         269         269  
Accounts receivable, net of allowance for doubtful accounts         924         924  
Adjustments for New Accounting Pronouncement [Member] | Adjustment for ASU on Revenue Recognition [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net revenues                   (307) (301)
Selling, general and administrative expenses                   (307) (301)
Net income attributable to Quest Diagnostics                   0 0
Provision for doubtful accounts                   (307) (301)
Accounts receivable                   307 $ 301
Accounts receivable         (256)         (256)  
Allowance for doubtful accounts         (256)         (256)  
Accounts receivable, net of allowance for doubtful accounts         $ 0         $ 0