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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Net revenues $ 1,919 $ 1,864 $ 3,803 $ 3,681  
Selling, general and administrative expenses 351 358 714 713  
Net income attributable to Quest Diagnostics 219 193 396 357  
Provision for doubtful accounts     0 4  
Accounts receivable     (127) (24)  
Accounts receivable         $ 937
Allowance for doubtful accounts 11   11   13
Accounts receivable, net of allowance for doubtful accounts $ 1,055   $ 1,055   924
Adjustments for New Accounting Pronouncement [Member] | As Reported [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Net revenues   1,943   3,842  
Selling, general and administrative expenses   437   874  
Net income attributable to Quest Diagnostics   193   357  
Provision for doubtful accounts       165  
Accounts receivable       (185)  
Accounts receivable         1,193
Allowance for doubtful accounts         269
Accounts receivable, net of allowance for doubtful accounts         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   (79)   (161)  
Selling, general and administrative expenses   (79)   (161)  
Net income attributable to Quest Diagnostics   $ 0   0  
Provision for doubtful accounts       (161)  
Accounts receivable       $ 161  
Accounts receivable         (256)
Allowance for doubtful accounts         (256)
Accounts receivable, net of allowance for doubtful accounts         $ 0