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Schedule II - Valuation Accounts and Reserves | 12 Months Ended
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Dec. 31, 2020
SEC Schedule, 12-09, 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 Credit Losses |  | Net Deductions and Other |  | Balance at End of Year
2020 |  |  |  |  |  |  |
Allowance for credit losses | $ | 15 |  |  | $ | 19 |  |  | $ | 6 |  | (a) | $ | 28 |
2019 |  |  |  |  |  |  |
Doubtful accounts and allowances | $ | 15 |  |  | $ | 11 |  |  | $ | 11 |  | (a) | $ | 15 |
2018 |  |  |  |  |  |  |
Doubtful accounts and allowances | $ | 13 |  |  | $ | 6 |  |  | $ | 4 |  | (a) | $ | 15 |
(a)Primarily represents the write-off of accounts receivable, net of recoveries.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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