Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Cash receipts from customers	$ 62,932	$ 56,446
Cash paid for inventory and prescriptions dispensed by retail network pharmacies	(50,268)	(44,657)
Cash paid to other suppliers and employees	(7,787)	(7,452)
Interest received	6	2
Interest paid	(331)	(267)
Income taxes paid	(1,483)	(1,530)
Net cash provided by operating activities	3,069	2,542
Cash flows from investing activities:
Purchases of property and equipment	(891)	(804)
Proceeds from sale-leaseback transactions	5	0
Proceeds from sale of property and equipment	7	11
Acquisitions (net of cash acquired) and other investments	(2,248)	(300)
Purchase of available-for-sale investments	161	0
Sales/maturities of available-for-sale investments	103	0
Net cash used in investing activities	(3,185)	(1,093)
Cash flows from financing activities:
Decrease in short-term debt	0	(690)
Repayments of long-term debt	(41)	0
Dividends paid	(647)	(553)
Proceeds from exercise of stock options	266	309
Excess tax benefits from stock-based compensation	65	34
Repurchase of common stock	(2,001)	(748)
Net cash used in financing activities	(2,358)	(1,648)
Effect of Exchange Rate on Cash and Cash Equivalents	(3)	(2)
Net decrease in cash and cash equivalents	(2,477)	(201)
Cash and cash equivalents at beginning of period	4,089	1,375
Cash and cash equivalents at end of period	1,612	1,174
Reconciliation of net income to net cash provided by operating activities:
Net income	2,375	2,078
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	965	951
Stock-based compensation	77	66
Deferred income taxes and other noncash items	44	82
Change in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	(584)	(575)
Inventories	(235)	192
Other current assets	(74)	165
Other assets	(23)	(138)
Accounts payable and claims and discounts payable	521	98
Accrued expenses	33	(401)
Other long-term liabilities	(30)	24
Net cash provided by operating activities	$ 3,069	$ 2,542