Segment Reporting (Details) (USD $)	3 Months Ended
	Mar. 31, 2014 type_of_transaction segment		Mar. 31, 2013		Dec. 31, 2013
Segment reporting information
Number of segments	3
Net revenues	$ 32,689,000,000		$ 30,751,000,000
Gross profit	5,942,000,000		5,577,000,000
Operating profit (loss)	2,024,000,000		1,694,000,000
Total assets	72,822,000,000				71,526,000,000
Goodwill	28,139,000,000				26,542,000,000
Number of type of transactions related to intersegment eliminations	2
Intersegment eliminations, intersegment revenues	1,100,000,000		939,000,000
Pharmacy Services Segment
Segment reporting information
Number of Centers of Excellence for Infusion and Enteral Services	6
Number of states pharmacies operated	40
Net revenues	20,195,000,000	[1]	18,311,000,000	[1]
Gross profit	934,000,000		768,000,000
Operating profit (loss)	640,000,000		499,000,000
Total assets	40,365,000,000				38,343,000,000
Goodwill	21,250,000,000				19,658,000,000
Net revenues, retail co-payments	2,200,000,000		2,200,000,000
Pharmacy Services Segment | Specialty stores
Segment reporting information
Number of pharmacies	24
Pharmacy Services Segment | Specialty mail order
Segment reporting information
Number of pharmacies	11
Pharmacy Services Segment | Mail service
Segment reporting information
Number of pharmacies	4
Pharmacy Services Segment | Infusion and Enteral Branches
Segment reporting information
Number of Infusion and Enteral Branches	84
Retail Pharmacy Segment
Segment reporting information
Number of states pharmacies operated	43
Number of retail drugstores	7,675
Net revenues	16,480,000,000		16,039,000,000
Gross profit	5,184,000,000		4,947,000,000
Operating profit (loss)	1,750,000,000		1,532,000,000
Total assets	30,960,000,000				30,191,000,000
Goodwill	6,889,000,000				6,884,000,000
Intersegment eliminations, intersegment gross profit	176,000,000		138,000,000
Number of retail drugstores operating a pharmacy	7,615
Retail Pharmacy Segment | MinuteClinic within CVS Pharmacy Stores
Segment reporting information
Number of clinics in retail drugstores	820
Retail Pharmacy Segment | MinuteClinic
Segment reporting information
Number of clinics	828
Retail Pharmacy Segment | Specialty stores
Segment reporting information
Number of pharmacies	17
Corporate Segment
Segment reporting information
Net revenues	0		0
Gross profit	0		0
Operating profit (loss)	(190,000,000)		(199,000,000)
Total assets	2,480,000,000				4,420,000,000
Goodwill	0				0
Intersegment Eliminations
Segment reporting information
Net revenues	(3,986,000,000)	[2]	(3,599,000,000)	[2]
Gross profit	(176,000,000)	[2]	(138,000,000)	[2]
Operating profit (loss)	(176,000,000)	[2]	(138,000,000)	[2]
Total assets	(983,000,000)	[2]			(1,428,000,000)	[2]
Goodwill	$ 0	[2]			$ 0	[2]

[1] Net revenues of the Pharmacy Services Segment include approximately $2.2 billion of retail co-payments for both of the three months ended March 31, 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 item (ii) intersegment activity above: net revenues of $1.1 billion and $939 million for the three months ended March 31, 2014 and 2013, respectively; and gross profit and operating profit of $176 million and $138 million for the three months ended March 31, 2014 and 2013, respectively.