Intersegment sales and expenses are recorded at fair value and eliminated in consolidation. Members served by our segments often use the same provider networks, enabling us in some instances to obtain more favorable contract terms with providers. Our segments also share indirect costs and assets. As a result, the profitability of each segment is interdependent. We allocate most operating expenses to our segments. Assets and certain corporate income and expenses are not allocated to the segments, including the portion of investment income not supporting segment operations, interest expense on corporate debt, and certain other corporate expenses. These items are managed at a corporate level. These corporate amounts are reported separately from our reportable segments and are included with intersegment eliminations in the tables presenting segment results below.

Our segment results were as follows for the three and nine months ended September 30, 2015 and 2014:



	Retail		Group		Healthcare Services		Other Businesses		Eliminations/ Corporate			Consolidated
	(in millions)
Three months ended September 30, 2015
Revenues - external customers
Premiums:
Individual Medicare Advantage	$	7,316	$	—	$	—	$	—	$	—		$	7,316
Group Medicare Advantage	1,396		—		—		—		—			1,396
Medicare stand-alone PDP	927		—		—		—		—			927
Total Medicare	9,639		—		—		—		—			9,639
Fully-insured	1,056		1,362		—		—		—			2,418
Specialty	66		260		—		—		—			326
Medicaid and other	592		6		—		6		—			604
Total premiums	11,353		1,628		—		6		—			12,987
Services revenue:
Provider	—		9		61		—		—			70
ASO and other	1		162		—		5		—			168
Pharmacy	—		—		8		—		—			8
Total services revenue	1		171		69		5		—			246
Total revenues - external customers	11,354		1,799		69		11		—			13,233
Intersegment revenues
Services	—		24		4,633		—		(4,657		)	—
Products	—		—		1,271		—		(1,271		)	—
Total intersegment revenues	—		24		5,904		—		(5,928		)	—
Investment income	38		7		—		16		69			130
Total revenues	11,392		1,830		5,973		27		(5,859		)	13,363
Operating expenses:
Benefits	9,777		1,341		—		22		(244		)	10,896
Operating costs	1,241		426		5,659		3		(5,641		)	1,688
Depreciation and amortization	49		24		30		—		(19		)	84
Total operating expenses	11,067		1,791		5,689		25		(5,904		)	12,668
Income from operations	325		39		284		2		45			695
Gain on sale of business	—		—		—		—		—			—
Interest expense	—		—		—		—		47			47
Income (loss) before income taxes	$	325	$	39	$	284	$	2	$	(2	)	$	648



	Retail		Group		Healthcare Services		Other Businesses		Eliminations/ Corporate			Consolidated
	(in millions)
Three months ended September 30, 2014
Revenues - external customers
Premiums:
Individual Medicare Advantage	$	6,448	$	—	$	—	$	—	$	—		$	6,448
Group Medicare Advantage	1,381		—		—		—		—			1,381
Medicare stand-alone PDP	806		—		—		—		—			806
Total Medicare	8,635		—		—		—		—			8,635
Fully-insured	926		1,335		—		—		—			2,261
Specialty	67		274		—		—		—			341
Medicaid and other	352		5		—		13		—			370
Total premiums	9,980		1,614		—		13		—			11,607
Services revenue:
Provider	—		6		320		—		—			326
ASO and other	10		172		—		2		—			184
Pharmacy	—		—		26		—		—			26
Total services revenue	10		178		346		2		—			536
Total revenues - external customers	9,990		1,792		346		15		—			12,143
Intersegment revenues
Services	—		22		3,879		—		(3,901		)	—
Products	—		—		968		—		(968		)	—
Total intersegment revenues	—		22		4,847		—		(4,869		)	—
Investment income	24		6		—		15		50			95
Total revenues	10,014		1,820		5,193		30		(4,819		)	12,238
Operating expenses:
Benefits	8,469		1,324		—		24		(151		)	9,666
Operating costs	1,156		468		4,953		5		(4,684		)	1,898
Depreciation and amortization	43		27		37		—		(22		)	85
Total operating expenses	9,668		1,819		4,990		29		(4,857		)	11,649
Income from operations	346		1		203		1		38			589
Interest expense	—		—		—		—		38			38
Income before income taxes	$	346	$	1	$	203	$	1	$	—		$	551




	Retail		Group		Healthcare Services		Other Businesses		Eliminations/ Corporate			Consolidated
	(in millions)
Nine months ended September 30, 2015
Revenues - external customers
Premiums:
Individual Medicare Advantage	$	22,183	$	—	$	—	$	—	$	—		$	22,183
Group Medicare Advantage	4,188		—		—		—		—			4,188
Medicare stand-alone PDP	2,915		—		—		—		—			2,915
Total Medicare	29,286		—		—		—		—			29,286
Fully-insured	3,263		4,125		—		—		—			7,388
Specialty	195		795		—		—		—			990
Medicaid and other	1,742		16		—		25		—			1,783
Total premiums	34,486		4,936		—		25		—			39,447
Services revenue:
Provider	—		29		590		—		—			619
ASO and other	7		485		—		10		—			502
Pharmacy	—		—		22		—		—			22
Total services revenue	7		514		612		10		—			1,143
Total revenues - external customers	34,493		5,450		612		35		—			40,590
Intersegment revenues
Services	—		68		13,561		—		(13,629		)	—
Products	—		—		3,654		—		(3,654		)	—
Total intersegment revenues	—		68		17,215		—		(17,283		)	—
Investment income	96		18		—		53		171			338
Total revenues	34,589		5,536		17,827		88		(17,112		)	40,928
Operating expenses:
Benefits	29,781		3,908		—		66		(602		)	33,153
Operating costs	3,708		1,323		16,978		10		(16,569		)	5,450
Depreciation and amortization	140		69		112		—		(54		)	267
Total operating expenses	33,629		5,300		17,090		76		(17,225		)	38,870
Income from operations	960		236		737		12		113			2,058
Gain on sale of business	—		—		—		—		267			267
Interest expense	—		—		—		—		140			140
Income before income taxes	$	960	$	236	$	737	$	12	$	240		$	2,185




	Retail		Group		Healthcare Services		Other Businesses		Eliminations/ Corporate			Consolidated
	(in millions)
Nine months ended September 30, 2014
Revenues - external customers
Premiums:
Individual Medicare Advantage	$	19,375	$	—	$	—	$	—	$	—		$	19,375
Group Medicare Advantage	4,131		—		—		—		—			4,131
Medicare stand-alone PDP	2,612		—		—		—		—			2,612
Total Medicare	26,118		—		—		—		—			26,118
Fully-insured	2,363		3,985		—		—		—			6,348
Specialty	192		824		—		—		—			1,016
Medicaid and other	735		15		—		42		—			792
Total premiums	29,408		4,824		—		42		—			34,274
Services revenue:
Provider	—		17		951		—		—			968
ASO and other	37		535		—		8		—			580
Pharmacy	—		—		72		—		—			72
Total services revenue	37		552		1,023		8		—			1,620
Total revenues - external customers	29,445		5,376		1,023		50		—			35,894
Intersegment revenues
Services	—		57		11,084		—		(11,141		)	—
Products	—		—		2,752		—		(2,752		)	—
Total intersegment revenues	—		57		13,836		—		(13,893		)	—
Investment income	71		17		—		45		145			278
Total revenues	29,516		5,450		14,859		95		(13,748		)	36,172
Operating expenses:
Benefits	25,044		3,753		—		73		(453		)	28,417
Operating costs	3,237		1,445		14,157		14		(13,335		)	5,518
Depreciation and amortization	120		77		108		2		(61		)	246
Total operating expenses	28,401		5,275		14,265		89		(13,849		)	34,181
Income from operations	1,115		175		594		6		101			1,991
Interest expense	—		—		—		—		108			108
Income (loss) before income taxes	$	1,115	$	175	$	594	$	6	$	(7	)	$	1,883