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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

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