Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Cash receipts from customers	$ 132,275	$ 133,055
Cash paid for inventory and prescriptions dispensed by retail network pharmacies	(110,320)	(110,788)
Cash paid to other suppliers and employees	(12,305)	(11,230)
Interest received	406	15
Interest paid	(1,759)	(869)
Income taxes paid	(1,911)	(2,040)
Net cash provided by operating activities	6,386	8,143
Cash flows from investing activities:
Purchases of property and equipment	(1,452)	(1,412)
Proceeds from sale-leaseback transactions		265
Proceeds from sale of property and equipment and other assets	11	20
Acquisitions (net of cash acquired) and other investments	(656)	(461)
Purchase of available-for-sale investments	(57)
Maturity of available-for-sale investments	43	21
Proceeds from sale of subsidiary	725
Net cash used in investing activities	(1,386)	(1,567)
Cash flows from financing activities:
Decrease in short-term debt	(1,276)	(1,764)
Proceeds from issuance of long-term debt	39,376
Repayments of long-term debt	(2,266)
Derivative settlements	446
Repurchase of common stock		(4,361)
Dividends paid	(1,528)	(1,539)
Proceeds from exercise of stock options	214	314
Payments for taxes related to net share settlement of equity awards	(39)	(70)
Other		(1)
Net cash provided by (used in) financing activities	34,927	(7,421)
Net increase (decrease) in cash, cash equivalents and restricted cash	39,927	(845)
Cash, cash equivalents and restricted cash at the beginning of the period	1,900	3,520
Cash, cash equivalents and restricted cash at the end of the period	41,827	2,675
Reconciliation of net income (loss) to net cash provided by operating activities:
Net income (loss)	(175)	3,336
Adjustments required to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	1,911	1,857
Goodwill impairments	3,921	135
Losses on settlement of defined benefit pension plans		187
Stock-based compensation	172	173
Deferred income taxes and other noncash items	296	271
Change in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	(1,725)	(280)
Inventories	472	620
Other current assets	116	(212)
Other assets	(119)	(15)
Accounts payable and claims and discounts payable	1,839	330
Accrued expenses	(341)	1,670
Other long-term liabilities	19	71
Net cash provided by operating activities	$ 6,386	$ 8,143