Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Cash receipts from customers	$ 128,545	$ 108,324
Cash paid for inventory and prescriptions dispensed by retail network pharmacies	(106,371)	(89,530)
Cash paid to other suppliers and employees	(11,092)	(11,240)
Interest received	14	15
Interest paid	(954)	(423)
Income taxes paid	(2,194)	(2,305)
Net cash provided by operating activities	7,948	4,841
Cash flows from investing activities:
Purchases of property and equipment	(1,607)	(1,490)
Proceeds from sale-leaseback transactions	230	34
Proceeds from sale of property and equipment and other assets	22	28
Acquisitions (net of cash acquired) and other investments	(333)	(9,503)
Purchase of available-for-sale investments	(40)	(184)
Sales/maturities of available-for-sale investments	76	115
Net cash used in investing activities	(1,652)	(11,000)
Cash flows from financing activities:
Increase in short-term debt	340	(685)
Proceeds from issuance of long-term debt	3,455	14,808
Repayments of long-term debt	(5,185)	(2,898)
Purchase of noncontrolling interest in subsidiary	(39)	0
Payment of contingent consideration	26	0
Dividends paid	(1,384)	(1,185)
Proceeds from exercise of stock options	205	277
Excess tax benefits from stock-based compensation	72	132
Repurchase of common stock	(4,000)	(3,871)
Other	(6)	(2)
Net cash provided by (used in) financing activities	(6,568)	6,576
Effect of exchange rate changes on cash and cash equivalents	2	(8)
Net increase (decrease) in cash and cash equivalents	(270)	409
Cash and cash equivalents at beginning of period	2,459	2,481
Cash and cash equivalents at end of period	2,189	2,890
Reconciliation of net income to net cash provided by operating activities:
Net income	3,612	3,740
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,847	1,510
Stock-based compensation	166	175
Loss on early extinguishment of debt	643	0
Deferred income taxes and other noncash items	119	(184)
Change in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	(1,714)	(2,530)
Inventories	(337)	(893)
Other current assets	2	591
Other assets	(86)	(13)
Accounts payable and claims and discounts payable	1,570	2,038
Accrued expenses	2,077	523
Other long-term liabilities	49	(116)
Net cash provided by operating activities	$ 7,948	$ 4,841