Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Cash receipts from customers	$ 71,014	$ 62,932
Cash paid for inventory and prescriptions dispensed by retail network pharmacies	(58,129)	(50,268)
Cash paid to other suppliers and employees	(7,935)	(7,787)
Interest received	9	6
Interest paid	(311)	(331)
Income taxes paid	(1,627)	(1,483)
Net cash provided by operating activities	3,021	3,069
Cash flows from investing activities:
Purchases of property and equipment	(942)	(891)
Proceeds from sale-leaseback transactions	34	5
Proceeds from sale of property and equipment and other assets	14	7
Acquisitions (net of cash acquired) and other investments	(112)	(2,248)
Purchase of available-for-sale investments	124	161
Sales/maturities of available-for-sale investments	40	103
Net cash used in investing activities	(1,090)	(3,185)
Cash flows from financing activities:
Increase in short-term debt	803	0
Repayments of long-term debt	550	41
Dividends paid	(794)	(647)
Proceeds from exercise of stock options	211	266
Excess tax benefits from stock-based compensation	97	65
Repurchase of common stock	(2,934)	(2,001)
Net cash used in financing activities	(3,167)	(2,358)
Effect of Exchange Rate on Cash and Cash Equivalents	(1)	(3)
Net decrease in cash and cash equivalents	(1,237)	(2,477)
Cash and cash equivalents at beginning of period	2,481	4,089
Cash and cash equivalents at end of period	1,244	1,612
Reconciliation of net income to net cash provided by operating activities:
Net income	2,493	2,375
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	978	965
Stock-based compensation	88	77
Deferred income taxes and other noncash items	6	44
Change in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	(1,211)	(584)
Inventories	(465)	(235)
Other current assets	131	(74)
Other assets	(48)	(23)
Accounts payable and claims and discounts payable	1,383	521
Accrued expenses	(241)	33
Other long-term liabilities	(93)	(30)
Net cash provided by operating activities	$ 3,021	$ 3,069