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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net revenues | $ 1,931 | $ 1,885 | $ 5,773 | $ 5,654 |
Selling, general and administrative expenses | 423 | 409 | 1,297 | 1,281 |
Net income attributable to Quest Diagnostics | $ 161 | $ 192 | $ 518 | $ 490 |
Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net revenues |  |  |  |  | $ 7,214
Selling, general and administrative expenses |  |  |  |  | 1,380
Net income attributable to Quest Diagnostics |  |  |  |  | 645
Adjustments for New Accounting Pronouncement [Member] | As Reported [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net revenues |  |  |  |  | 7,515
Selling, general and administrative expenses |  |  |  |  | 1,681
Net income attributable to Quest Diagnostics |  |  |  |  | 645
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 |  |  |  |  | (301)
Selling, general and administrative expenses |  |  |  |  | (301)
Net income attributable to Quest Diagnostics |  |  |  |  | $ 0

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