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Quarterly Operating Results (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Data [Abstract] |
Quarterly Operating Results |
2018 (a) | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total Year
| (b) |  | (c) |  | (d) |  | (e) |  |
Net revenues | $ | 1,884 |  |  | $ | 1,919 |  |  | $ | 1,889 |  |  | $ | 1,839 |  |  | $ | 7,531 |
Gross profit | 658 |  |  | 676 |  |  | 667 |  |  | 604 |  |  | 2,605 |
Net income | 189 |  |  | 233 |  |  | 227 |  |  | 139 |  |  | 788 |
Less: Net income attributable to noncontrolling interests | 12 |  |  | 14 |  |  | 14 |  |  | 12 |  |  | 52 |
Net income attributable to Quest Diagnostics | $ | 177 |  |  | $ | 219 |  |  | $ | 213 |  |  | $ | 127 |  |  | $ | 736 |
Earnings per share attributable to Quest Diagnostics' stockholders: |  |  |  |  |  |  |  |  |
Basic | $ | 1.30 |  |  | $ | 1.60 |  |  | $ | 1.56 |  |  | $ | 0.93 |  |  | $ | 5.39 |
Diluted | $ | 1.27 |  |  | $ | 1.57 |  |  | $ | 1.53 |  |  | $ | 0.92 |  |  | $ | 5.29 |
2017 (a) | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total Year
| (f) |  | (g) |  | (h) |  | (i) |  |
Net revenues | $ | 1,817 |  |  | $ | 1,864 |  |  | $ | 1,856 |  |  | $ | 1,865 |  |  | $ | 7,402 |
Gross profit | 652 |  |  | 694 |  |  | 666 |  |  | 671 |  |  | 2,683 |
Net income | 175 |  |  | 207 |  |  | 175 |  |  | 267 |  |  | 824 |
Less: Net income attributable to noncontrolling interests | 11 |  |  | 14 |  |  | 14 |  |  | 13 |  |  | 52 |
Net income attributable to Quest Diagnostics | $ | 164 |  |  | $ | 193 |  |  | $ | 161 |  |  | $ | 254 |  |  | $ | 772 |
Earnings per share attributable to Quest Diagnostics' stockholders: |  |  |  |  |  |  |  |  |
Basic | $ | 1.19 |  |  | $ | 1.40 |  |  | $ | 1.18 |  |  | $ | 1.86 |  |  | $ | 5.63 |
Diluted | $ | 1.16 |  |  | $ | 1.37 |  |  | $ | 1.15 |  |  | $ | 1.82 |  |  | $ | 5.50 |
(a) | The process for estimating revenues and the ultimate collection of accounts receivable involves significant judgment and estimation. The Company follows a standard process, which considers historical denial and collection experience and other factors, to estimate contractual allowances and implicit price concessions, recording adjustments in the current period as changes in estimates. Based on this process, during the fourth quarter of 2018, the Company increased its reserves for revenues and accounts receivable by approximately $35 million (see Note 3 to the consolidated financial statements). Net revenues for 2017 have been restated to reflect the impact of new revenue recognition rules that became effective January 1, 2018 and were adopted on a retrospective basis (see Note 2 to the consolidated financial statements).
(b) | Included pre-tax charges of $31 million, primarily associated with workforce reduction, systems conversions and integration incurred in connection with further restructuring and integrating the Company ($12 million in cost of services, $18 million in selling, general and administrative expenses and $1 million in other operating (income) expense, net); and excess tax benefits associated with stock-based compensation arrangements of $8 million recorded in income tax expense.
(c) | Included pre-tax charges of $25 million, primarily associated with workforce reduction, systems conversions and integration incurred in connection with further restructuring and integrating the Company ($14 million in cost of services and $11 million in selling, general and administrative expenses); net pre-tax charges of $10 million, primarily associated with certain legal matters partially offset by a gain associated with an insurance claim for hurricane related losses ($11 million in cost of services offset by a $1 million gain in other operating (income) expense, net); excess tax benefits associated with stock-based compensation arrangements of $5 million recorded in income tax expense; and an income tax benefit of $15 million associated with a change in a tax return accounting method that enabled the company to accelerate the deduction of certain expenses on its 2017 tax return at the federal corporate statutory tax rate in effect during 2017.
(d) | Included pre-tax charges of $19 million, primarily associated with workforce reduction, systems conversions and integration incurred in connection with further restructuring and integrating the Company ($10 million in cost of services and $9 million in selling, general and administrative expenses); a pre-tax benefit of $12 million primarily associated with the decrease in the fair value of the contingent consideration accrual associated with the MedXM acquisition partially offset by non-cash asset impairment charges ($13 million gain in other operating (income) expense, net offset by $1 million in cost of services); and excess tax benefits associated with stock-based compensation arrangements of $4 million recorded in income tax expense.
(e) | Included pre-tax charges of $47 million, primarily associated with workforce reductions, systems conversions and integration incurred in connection with further restructuring and integrating the Company ($20 million in cost of services and $27 million in selling, general and administrative expenses); pre-tax charges of $4 million, primarily associated with the loss on the sale of a foreign subsidiary recorded in loss (gain) on disposition of business; $1 million of income tax expense associated with finalizing the impact of the enactment of TCJA; and excess tax benefits associated with stock-based compensation arrangements of $1 million recorded in income tax expense.
(f) | Included pre-tax charges of $18 million, primarily associated with systems conversions and integration incurred in connection with further restructuring and integrating the Company ($10 million in cost of services and $8 million in selling, general and administrative expenses); and excess tax benefits associated with stock-based compensation arrangements of $16 million recorded in income tax expense.
(g) | Included pre-tax charges of $23 million, primarily associated with systems conversions and integration incurred in connection with further restructuring and integrating the Company ($9 million in cost of services, $13 million in selling, general and administrative expenses, and $1 million in equity in earnings of equity method investees, net of taxes); pre-tax gain of $7 million related to the sale of an interest in an equity method investment recorded in other (expense) income, net; $2 million in costs incurred related to certain legal matters recorded in selling, general and administrative expenses; and excess tax benefits associated with stock-based compensation arrangements of $13 million recorded in income tax expense.
(h) | Included pre-tax charges of $23 million, primarily associated with systems conversions and integration incurred in connection with further restructuring and integrating the Company ($12 million in cost of services and $11 million in selling, general and administrative expenses); pre-tax charges of $9 million primarily associated with non-cash asset impairment charges and incremental costs incurred as a result of hurricanes ($3 million in cost of services, $1 million in selling, general and administrative expenses, and $5 million in other (expense) income, net); and excess tax benefits associated with stock-based compensation arrangements of $7 million recorded in income tax expense.
(i) | Included pre-tax charges of $42 million, primarily associated with systems conversions, integration and workforce reductions incurred in connection with further restructuring and integrating the Company ($14 million in cost of services and $28 million in selling, general and administrative expenses); pre-tax charges of $6 million, primarily related to non-cash asset impairment charges and incremental costs incurred as a result of the hurricanes ($2 million in cost of services and $4 million in selling, general and administrative expenses); a provisional estimated income tax benefit of $106 million associated with the TCJA, including a deferred income tax benefit of $115 million primarily due to the remeasurement of net deferred tax liabilities and reserves at the new combined federal and state tax rate, partially offset by $9 million of current tax expense primarily due to the mandatory repatriation toll charge on undistributed foreign earnings and profits; and excess tax benefits associated with stock-based compensation arrangements of $1 million recorded in income tax expense.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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