Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Cash receipts from customers	$ 84,324	$ 71,014
Cash paid for inventory and prescriptions dispensed by retail network pharmacies	(70,851)	(58,129)
Cash paid to other suppliers and employees	(7,082)	(7,935)
Interest received	9	9
Interest paid	(615)	(311)
Income taxes paid	(1,762)	(1,627)
Net cash provided by operating activities	4,023	3,021
Cash flows from investing activities:
Purchases of property and equipment	(1,102)	(942)
Proceeds from sale-leaseback transactions	0	34
Proceeds from sale of property and equipment and other assets	11	14
Acquisitions (net of cash acquired) and other investments	(168)	(112)
Purchase of available-for-sale investments	(39)	(124)
Sales/maturities of available-for-sale investments	67	40
Net cash used in investing activities	(1,231)	(1,090)
Cash flows from financing activities:
Increase in short-term debt	745	803
Proceeds from issuance of long-term debt	3,455	0
Repayments of long-term debt	(3,579)	(550)
Purchase of noncontrolling interest in subsidiary	(39)	0
Dividends paid	(929)	(794)
Proceeds from exercise of stock options	122	211
Excess tax benefits from stock-based compensation	63	97
Repurchase of common stock	(3,960)	(2,934)
Other	(4)	0
Net cash used in financing activities	(4,126)	(3,167)
Effect of exchange rate changes on cash and cash equivalents	2	(1)
Net decrease in cash and cash equivalents	(1,332)	(1,237)
Cash and cash equivalents at beginning of period	2,459	2,481
Cash and cash equivalents at end of period	1,127	1,244
Reconciliation of net income to net cash provided by operating activities:
Net income	2,071	2,493
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,236	978
Stock-based compensation	107	88
Loss on early extinguishment of debt	542	0
Deferred income taxes and other noncash items	75	6
Change in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	(1,279)	(1,211)
Inventories	(167)	(465)
Other current assets	(170)	131
Other assets	(53)	(48)
Accounts payable and claims and discounts payable	1,164	1,383
Accrued expenses	492	(241)
Other long-term liabilities	5	(93)
Net cash provided by operating activities	$ 4,023	$ 3,021