Segment Reporting (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014 type_of_transaction segment		Sep. 30, 2013		Dec. 31, 2013
Segment reporting information
Number of segments					3
Net revenues	$ 35,021,000,000		$ 31,932,000,000		$ 102,312,000,000		$ 93,931,000,000
Gross profit	6,468,000,000		6,027,000,000		18,734,000,000		17,444,000,000
Operating profit (loss)	2,246,000,000		2,154,000,000	[1]	6,478,000,000		5,820,000,000	[1]
Total assets	73,576,000,000				73,576,000,000				71,526,000,000
Goodwill	28,151,000,000				28,151,000,000				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		3,600,000,000		3,100,000,000
Proceeds from Legal Settlements							72,000,000
Pharmacy Services Segment
Segment reporting information
Number of Centers of Excellence for Infusion and Enteral Services	6				6
Number of states pharmacies operated	40				40
Net revenues	22,534,000,000	[2]	19,483,000,000	[2]	64,566,000,000	[2]	56,593,000,000	[2]
Gross profit	1,403,000,000		1,294,000,000		3,533,000,000		3,025,000,000
Operating profit (loss)	1,087,000,000		1,012,000,000	[1]	2,605,000,000		2,186,000,000	[1]
Total assets	42,527,000,000				42,527,000,000				38,343,000,000
Goodwill	21,234,000,000				21,234,000,000				19,658,000,000
Net revenues, retail co-payments	1,900,000,000		1,900,000,000		6,100,000,000		6,100,000,000
Proceeds from Legal Settlements							11,000,000
Pharmacy Services Segment | Specialty stores
Segment reporting information
Number of pharmacies	26				26
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	44				44
Number of retail drugstores	7,779				7,779
Net revenues	16,749,000,000		16,248,000,000		50,100,000,000		48,426,000,000
Gross profit	5,237,000,000		4,876,000,000		15,719,000,000		14,828,000,000
Operating profit (loss)	1,527,000,000		1,464,000,000	[1]	4,982,000,000		4,596,000,000	[1]
Total assets	31,197,000,000				31,197,000,000				30,191,000,000
Goodwill	6,917,000,000				6,917,000,000				6,884,000,000
Intersegment eliminations, intersegment gross profit	172,000,000		143,000,000		518,000,000		409,000,000
Number of retail drugstores operating a pharmacy	7,714				7,714
Proceeds from Legal Settlements							61,000,000
Retail Pharmacy Segment | MinuteClinic within CVS Pharmacy Stores
Segment reporting information
Number of clinics in retail drugstores	928				928
Retail Pharmacy Segment | MinuteClinic
Segment reporting information
Number of clinics	936				936
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)	(196,000,000)		(179,000,000)		(591,000,000)		(553,000,000)
Total assets	1,344,000,000				1,344,000,000				4,420,000,000
Goodwill	0				0				0
Intersegment Eliminations
Segment reporting information
Net revenues	(4,262,000,000)	[3]	(3,799,000,000)	[3]	(12,354,000,000)	[3]	(11,088,000,000)	[3]
Gross profit	(172,000,000)	[3]	(143,000,000)	[3]	(518,000,000)	[3]	(409,000,000)	[3]
Operating profit (loss)	(172,000,000)	[3]	(143,000,000)	[3]	(518,000,000)	[3]	(409,000,000)	[3]
Total assets	(1,492,000,000)	[3]			(1,492,000,000)	[3]			(1,428,000,000)	[3]
Goodwill	$ 0	[3]			$ 0	[3]			$ 0	[3]

[1] Consolidated operating profit for the three and nine months ended September 30, 2013 includes a $72 million gain on a legal settlement, of which, $11 million is included in the Pharmacy Services Segment and $61 million is included in the Retail Pharmacy Segment.

[2] Net revenues of the Pharmacy Services Segment include approximately $1.9 billion of retail co-payments for both the three months ended September 30, 2014 and 2013, as well as $6.1 billion of retail co-payments for both the nine months ended September 30, 2014 and 2013.

[3] 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 September 30, 2014 and 2013, respectively, and $3.6 billion and $3.1 billion for the nine months ended September 30, 2014 and 2013, respectively; and gross profit and operating profit of $172 million and $143 million for the three months ended September 30, 2014 and 2013, respectively, and $518 million and $409 million for the nine months ended September 30, 2014 and 2013, respectively.