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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 |

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