Segment Reporting (Details) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015 USD ($) Mail_Service_Pharmacy state drugstore pharmacy	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Mail_Service_Pharmacy state segment drugstore type_of_transaction pharmacy	Jun. 30, 2014 USD ($)
Segment reporting information
Number of segments | segment				3
Net revenues		$ 37,169	$ 34,602	$ 73,501	$ 67,291
Gross profit		6,402	6,324	12,566	12,266
Operating profit (loss)(3)		2,262	2,208	$ 4,394	4,232
Number of type of transactions related to intersegment eliminations | type_of_transaction				2
Intersegment eliminations, intersegment revenues		$ 1,200	1,200	$ 2,400	2,300
Pharmacy Services Segment
Segment reporting information
Number of Centers of Excellence for Infusion and Enteral Services		6		6
Number of states pharmacies operated | state		40		40
Net revenues	[1]	$ 24,442	21,836	$ 48,321	42,031
Gross profit		1,241	1,195	2,267	2,129
Operating profit (loss)(3)		940	878	1,675	1,518
Net revenues, retail co-payments		$ 2,200	2,000	$ 4,700	4,200
Pharmacy Services Segment | Specialty stores
Segment reporting information
Number of pharmacies | pharmacy		24		24
Pharmacy Services Segment | Specialty mail order
Segment reporting information
Number of pharmacies | pharmacy		11		11
Pharmacy Services Segment | Mail service
Segment reporting information
Number of pharmacies | Mail_Service_Pharmacy		4		4
Pharmacy Services Segment | Infusion and Enteral Branches
Segment reporting information
Number of Infusion and Enteral Branches | Mail_Service_Pharmacy		85		85
Pharmacy Services Segment | Ambulatory infusion suites [Member]
Segment reporting information
Number of Infusion and Enteral Branches | Mail_Service_Pharmacy		72		72
Retail Pharmacy Segment
Segment reporting information
Number of states pharmacies operated | state		44		44
Number of retail drugstores | drugstore		7,870		7,870
Net revenues		$ 17,242	16,871	$ 34,193	33,351
Gross profit		5,322	5,299	10,617	10,483
Operating profit (loss)(3)		1,681	1,705	3,408	3,455
Intersegment eliminations, intersegment gross profit		$ 161	170	$ 318	346
Number of retail drugstores operating a pharmacy | drugstore		7,812		7,812
Segment Reporting Information, Operating Profit Recorded by More than One Reporting Segment		$ 144	170	$ 285	346
Retail Pharmacy Segment | MinuteClinic within CVS Pharmacy Stores
Segment reporting information
Number of clinics in retail drugstores | drugstore		989		989
Retail Pharmacy Segment | MinuteClinic
Segment reporting information
Number of clinics | drugstore		997		997
Retail Pharmacy Segment | Specialty stores
Segment reporting information
Number of pharmacies | drugstore		18		18
Intersegment Eliminations
Segment reporting information
Net revenues	[2]	$ (4,515)	(4,105)	$ (9,013)	(8,091)
Gross profit	[2]	(161)	(170)	(318)	(346)
Operating profit (loss)(3)	[2]	(144)	(170)	(285)	(346)
Corporate Segment
Segment reporting information
Net revenues		0	0	0	0
Gross profit		0	0	0	0
Operating profit (loss)(3)		(215)	$ (205)	(404)	$ (395)
Business Combination, Acquisition Related Costs		$ 21		$ 21

[1] Net revenues of the Pharmacy Services Segment include approximately $2.2 billion and $2.0 billion of retail co-payments for the three months ended June 30, 2015 and 2014, respectively, as well as $4.7 billion and $4.2 billion of retail co-payments for the six months ended June 30, 2015 and 2014, respectively.

[2] Intersegment eliminations relate to two types of transactions: (i) Intersegment revenues that occur when Pharmacy Services Segment customers use Retail Pharmacy Segment stores to purchase covered products. When this occurs, both the Pharmacy Services and Retail Pharmacy segments record the revenue on a stand-alone basis, and (ii) Intersegment revenues, gross profit and operating profit that occur when Pharmacy Services Segment customers, through the Company’s intersegment activities (such as the Maintenance Choice® program), elect to pick-up their maintenance prescriptions at Retail Pharmacy Segment stores instead of receiving them through the mail. When this occurs, both the Pharmacy Services and Retail Pharmacy segments record the revenue, gross profit and operating profit on a standalone basis. The following amounts are eliminated in consolidation in connection with the intersegment activity described in item (ii) above: net revenues of $1.2 billion for both the three months ended June 30, 2015 and 2014, and $2.4 billion and $2.3 billion for the six months ended June 30, 2015 and 2014, respectively; gross profit of $161 million and $170 million for the three months ended June 30, 2015 and 2014, respectively, and $318 million and $346 million for the six months ended June 30, 2015 and 2014, respectively; and operating profit of $144 million and $170 million for the three months ended June 30, 2015 and 2014, respectively, and $285 million and $346 million for the six months ended June 30, 2015 and 2014, respectively.