Commitments and Contingencies (Details) (USD $)	1 Months Ended		3 Months Ended	1 Months Ended
	Oct. 31, 2003 competitor entity pharmacy	Mar. 31, 2014 store_lease	Mar. 31, 2014 Lauriello Lawsuit	Mar. 31, 2010 Multi-state investigation under FTC state	Mar. 31, 2014 SEC investigation
Loss contingencies
Number of store leases guaranteed		72
Date store lease guarantees extend		2026
Lauriello lawsuit, amount sought in compensatory damages plus other non-specified damages			$ 3,200,000,000
Number of pharmacies filing putative action	2
Number of competitors against whom putative actions are filed	2
Number of Caremark entities named as defendants	2
Number of states participating in multi-state investigation				28
Civil penalty under SEC					$ 20,000,000