BUSINESS SEGMENT INFORMATION

The Company's DIS business is the only reportable segment based on the manner in which the Chief Executive Officer, who is the Company's chief operating decision maker ("CODM"), assesses performance and allocates resources across the organization. The DIS business provides diagnostic information services to a broad range of customers, including patients, clinicians, hospitals, IDNs, health plans, employers and ACOs. The Company is the world's leading provider of diagnostic information services, which includes providing information and insights based on the industry-leading menu of routine, non-routine and advanced clinical testing and anatomic pathology testing, and other diagnostic information services. The DIS business accounted for greater than 95% of net revenues in 2018 and 2017.

All other operating segments include the Company's DS businesses, which consist of its risk assessment services and healthcare information technology businesses. The Company's DS businesses are the leading provider of risk assessment services for the life insurance industry and offer healthcare organizations and clinicians robust information technology solutions.

As of September 30, 2018, substantially all of the Company’s services were provided within the United States, and substantially all of the Company’s assets were located within the United States.

The following table is a summary of segment information for the three and nine months ended September 30, 2018 and 2017. Segment asset information is not presented since it is not used by the CODM at the operating segment level. Operating earnings (loss) of each segment represents net revenues less directly identifiable expenses to arrive at operating income (loss) for the segment. General corporate activities included in the table below are comprised of general management and administrative corporate expenses, amortization and impairment of intangibles assets and other operating income and expenses, net of certain general corporate activity costs that are allocated to the DIS and DS businesses. The accounting policies of the segments are the same as those of the Company as set forth in Note 2 to the consolidated financial statements contained in the Company’s 2017 Annual Report on Form 10-K and Note 2 to the interim unaudited consolidated financial statements.



	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Net revenues:
DIS business	$	1,810		$	1,777		$	5,448		$	5,283
All other operating segments	79			79			244			254
Total net revenues	$	1,889		$	1,856		$	5,692		$	5,537

Operating earnings (loss):
DIS business	$	333		$	334		$	982		$	987
All other operating segments	11			10			33			40
General corporate activities	(40		)	(46		)	(134		)	(131		)
Total operating income	304			298			881			896
Non-operating expenses, net	(38		)	(40		)	(122		)	(100		)
Income before income taxes and equity in earnings of equity method investees	266			258			759			796
Income tax expense	(48		)	(92		)	(142		)	(264		)
Equity in earnings of equity method investees, net of taxes	9			9			32			25
Net income	227			175			649			557
Less: Net income attributable to noncontrolling interests	14			14			40			39
Net income attributable to Quest Diagnostics	$	213		$	161		$	609		$	518