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Schedule II - Valuation Accounts and Reserves | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
SCHEDULE II - VALUATION ACCOUNTS AND RESERVES | QUEST DIAGNOSTICS INCORPORATED AND SUBSIDIARIES SCHEDULE II - VALUATION ACCOUNTS AND RESERVES (in millions)
| Balance at Beginning of Year |  | Provision for Doubtful Accounts |  | Net Deductions and Other |  | Balance at End of Year
Year Ended December 31, 2017 |  |  |  |  |  |  |
Doubtful accounts and allowances | $ | 265 |  |  | $ | 315 |  |  | $ | 311 |  | (a) | $ | 269 |
Year Ended December 31, 2016 |  |  |  |  |  |  |
Doubtful accounts and allowances | $ | 254 |  |  | $ | 308 |  |  | $ | 297 |  | (a) | $ | 265 |
Year Ended December 31, 2015 |  |  |  |  |  |  |
Doubtful accounts and allowances | $ | 250 |  |  | $ | 297 |  |  | $ | 293 |  | (a) | $ | 254 |
(a) | Primarily represents the write-off of accounts receivable, net of recoveries.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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- References No definition available. + Details
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