Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Cash receipts from customers	$ 184,519	$ 132,275
Cash paid for inventory and prescriptions dispensed by retail network pharmacies	(109,958)	(107,920)
Insurance benefits paid	(38,812)	(2,400)
Cash paid to other suppliers and employees	(21,411)	(12,305)
Interest and investment income received	756	406
Interest paid	(2,675)	(1,759)
Income taxes paid	(2,205)	(1,911)
Net cash provided by operating activities	10,214	6,386
Cash flows from investing activities:
Proceeds from sales and maturities of investments	5,616	43
Purchases of investments	(6,011)	(97)
Purchases of property and equipment	(1,890)	(1,452)
Acquisitions (net of cash acquired)	(361)	(616)
Proceeds from sale of subsidiary	0	725
Other	16	11
Net cash used in investing activities	(2,630)	(1,386)
Cash flows from financing activities:
Net borrowings (repayments) of short-term debt	350	(1,276)
Proceeds from issuance of long-term debt	3,458	39,376
Repayments of long-term debt	(8,350)	(2,266)
Derivative settlements	(25)	446
Dividends paid	(1,952)	(1,528)
Proceeds from exercise of stock options	183	214
Payments for taxes related to net share settlement of equity awards	(85)	(39)
Other	11	0
Net cash provided by (used in) financing activities	(6,410)	34,927
Net increase in cash, cash equivalents and restricted cash	1,174	39,927
Cash, cash equivalents and restricted cash at the beginning of the period	4,295	1,900
Cash, cash equivalents and restricted cash at the end of the period	5,469	41,827
Reconciliation of net income (loss) to net cash provided by operating activities:
Net income (loss)	4,887	(175)
Adjustments required to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	3,275	1,911
Goodwill impairment	0	3,921
Stock-based compensation	355	172
Loss on sale of subsidiary	205	86
Loss on early extinguishment of debt	79	0
Deferred income taxes and other noncash items	(38)	210
Change in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	(2,312)	(1,725)
Inventories	413	472
Other assets	(374)	(3)
Accounts payable and pharmacy claims and discounts payable	2,330	1,839
Health care costs payable and other insurance liabilities	535	0
Other liabilities	859	(322)
Net cash provided by operating activities	$ 10,214	$ 6,386