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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net revenues | $ 1,889 | $ 1,856 | $ 5,692 | $ 5,537 |
Selling, general and administrative expenses | 354 | 348 | 1,068 | 1,061 |
Net income attributable to Quest Diagnostics | 213 | 161 | 609 | 518 |
Provision for doubtful accounts |  |  | 2 | 5 |
Accounts receivable |  |  | (166) | (29) |
Accounts receivable |  |  |  |  | $ 937
Allowance for doubtful accounts | 10 |  | 10 |  | 13
Accounts receivable, net of allowance for doubtful accounts | $ 1,097 |  | $ 1,097 |  | 924
Adjustments for New Accounting Pronouncement [Member] | As Reported [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net revenues |  | 1,931 |  | 5,773 |
Selling, general and administrative expenses |  | 423 |  | 1,297 |
Net income attributable to Quest Diagnostics |  | 161 |  | 518 |
Provision for doubtful accounts |  |  |  | 241 |
Accounts receivable |  |  |  | (265) |
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 |  | (75) |  | (236) |
Selling, general and administrative expenses |  | (75) |  | (236) |
Net income attributable to Quest Diagnostics |  | $ 0 |  | 0 |
Provision for doubtful accounts |  |  |  | (236) |
Accounts receivable |  |  |  | $ 236 |
Accounts receivable |  |  |  |  | (256)
Allowance for doubtful accounts |  |  |  |  | (256)
Accounts receivable, net of allowance for doubtful accounts |  |  |  |  | $ 0

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