Segment Reporting (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014 type_of_transaction segment		Jun. 30, 2013	Dec. 31, 2013
Segment reporting information
Number of segments					3
Net revenues	$ 34,602,000,000		$ 31,248,000,000		$ 67,291,000,000		$ 61,999,000,000
Gross profit	6,324,000,000		5,841,000,000		12,266,000,000		11,418,000,000
Operating profit (loss)	2,208,000,000		1,972,000,000		4,232,000,000		3,666,000,000
Total assets	72,593,000,000				72,593,000,000			71,526,000,000
Goodwill	28,126,000,000				28,126,000,000			26,542,000,000
Number of type of transactions related to intersegment eliminations					2
Intersegment eliminations, intersegment revenues	1,200,000,000		1,100,000,000		2,300,000,000		2,000,000,000
Pharmacy Services Segment
Segment reporting information
Number of Centers of Excellence for Infusion and Enteral Services	6				6
Number of states pharmacies operated	41				41
Net revenues	21,836,000,000	[1]	18,800,000,000	[1]	42,031,000,000		37,111,000,000
Gross profit	1,195,000,000		963,000,000		2,129,000,000		1,731,000,000
Operating profit (loss)	878,000,000		675,000,000		1,518,000,000		1,174,000,000
Total assets	41,189,000,000				41,189,000,000			38,343,000,000
Goodwill	21,233,000,000				21,233,000,000			19,658,000,000
Net revenues, retail co-payments	2,000,000,000		2,000,000,000		4,200,000,000		4,200,000,000
Pharmacy Services Segment | Specialty stores
Segment reporting information
Number of pharmacies	24				24
Pharmacy Services Segment | Specialty mail order
Segment reporting information
Number of pharmacies	11				11
Pharmacy Services Segment | Mail service
Segment reporting information
Number of pharmacies	4				4
Pharmacy Services Segment | Infusion and Enteral Branches
Segment reporting information
Number of Infusion and Enteral Branches	84				84
Retail Pharmacy Segment
Segment reporting information
Number of states pharmacies operated	43				43
Number of retail drugstores	7,705				7,705
Net revenues	16,871,000,000		16,139,000,000		33,351,000,000		32,179,000,000
Gross profit	5,299,000,000		5,005,000,000		10,483,000,000		9,952,000,000
Operating profit (loss)	1,705,000,000		1,600,000,000		3,455,000,000		3,132,000,000
Total assets	30,803,000,000				30,803,000,000			30,191,000,000
Goodwill	6,893,000,000				6,893,000,000			6,884,000,000
Intersegment eliminations, intersegment gross profit	170,000,000		127,000,000		346,000,000		265,000,000
Number of retail drugstores operating a pharmacy	7,647				7,647
Retail Pharmacy Segment | MinuteClinic within CVS Pharmacy Stores
Segment reporting information
Number of clinics in retail drugstores	852				852
Retail Pharmacy Segment | MinuteClinic
Segment reporting information
Number of clinics	860				860
Retail Pharmacy Segment | Specialty stores
Segment reporting information
Number of pharmacies	17				17
Corporate Segment
Segment reporting information
Net revenues	0		0		0		0
Gross profit	0		0		0		0
Operating profit (loss)	(205,000,000)		(176,000,000)		(395,000,000)		(375,000,000)
Total assets	1,790,000,000				1,790,000,000			4,420,000,000
Goodwill	0				0			0
Intersegment Eliminations
Segment reporting information
Net revenues	(4,105,000,000)	[2]	(3,691,000,000)	[2]	(8,091,000,000)		(7,291,000,000)
Gross profit	(170,000,000)	[2]	(127,000,000)	[2]	(346,000,000)		(265,000,000)
Operating profit (loss)	(170,000,000)	[2]	(127,000,000)	[2]	(346,000,000)		(265,000,000)
Total assets	(1,189,000,000)	[2]			(1,189,000,000)	[2]		(1,428,000,000)	[2]
Goodwill	$ 0	[2]			$ 0	[2]		$ 0	[2]

[1] Net revenues of the Pharmacy Services Segment include approximately $2.0 billion of retail co-payments for the three months ended both June 30, 2014 and 2013, as well as $4.2 billion of retail co-payments for the six months ended both June 30, 2014 and 2013.

[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 and $1.1 billion for the three months ended June 30, 2014 and 2013, respectively, and $2.3 billion and $2.0 billion for the six months ended June 30, 2014 and 2013, respectively; and gross profit and operating profit of $170 million and $127 million for the three months ended June 30, 2014 and 2013, respectively, and $346 million and $265 million for the six months ended June 30, 2014 and 2013, respectively.