Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Cash receipts from customers	$ 95,816	$ 85,408
Cash paid for inventory and prescriptions dispensed by retail network pharmacies	(77,067)	(67,826)
Cash paid to other suppliers and employees	(11,267)	(10,760)
Interest received	11	5
Interest paid	(458)	(369)
Income taxes paid	(2,321)	(2,213)
Net cash provided by operating activities	4,714	4,245
Cash flows from investing activities:
Purchases of property and equipment	(1,436)	(1,330)
Proceeds from sale-leaseback transactions	328	156
Proceeds from sale of property and equipment	8	13
Acquisitions (net of cash acquired) and other investments	(2,392)	(354)
Purchase of available-for-sale investments	161	107
Sales/maturities of available-for-sale investments	119	0
Net cash used in investing activities	(3,534)	(1,622)
Cash flows from financing activities:
Increase in short-term debt	775	124
Proceeds from issuance of long-term debt	1,483	0
Repayments of long-term debt	(3,086)	0
Dividends paid	(971)	(829)
Proceeds from exercise of stock options	378	431
Excess tax benefits from stock-based compensation	89	48
Repurchase of common stock	(2,801)	(2,272)
Net cash used in financing activities	(4,133)	(2,498)
Effect of Exchange Rate on Cash and Cash Equivalents	(4)	5
Net increase (decrease) in cash and cash equivalents	(2,957)	130
Cash and cash equivalents at beginning of period	4,089	1,375
Cash and cash equivalents at end of period	1,132	1,505
Reconciliation of net income to net cash provided by operating activities:
Net income	3,323	3,327
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,442	1,412
Stock-based compensation	121	101
Loss on Extinguishment of Debt	521
Deferred income taxes and other noncash items	(64)	129
Change in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	(1,872)	(1,518)
Inventories	(449)	(79)
Other current assets	(160)	176
Other assets	(19)	(125)
Accounts payable and claims and discounts payable	1,222	697
Accrued expenses	676	76
Other long-term liabilities	(27)	49
Net cash provided by operating activities	$ 4,714	$ 4,245