Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Cash receipts from customers	$ 195,554	$ 184,519
Cash paid for inventory and prescriptions dispensed by retail network pharmacies	(116,590)	(109,958)
Insurance benefits paid	(40,221)	(38,812)
Cash paid to other suppliers and employees	(22,185)	(21,411)
Interest and investment income received	622	756
Interest paid	(2,517)	(2,675)
Income taxes paid	(2,365)	(2,205)
Net cash provided by operating activities	12,298	10,214
Cash flows from investing activities:
Proceeds from sales and maturities of investments	3,790	5,616
Purchases of investments	(6,377)	(6,011)
Purchases of property and equipment	(1,724)	(1,890)
Acquisitions (net of cash acquired)	(828)	(361)
Proceeds from sale of subsidiary	834	0
Other	5	16
Net cash used in investing activities	(4,300)	(2,630)
Cash flows from financing activities:
Net borrowings of short-term debt	0	350
Proceeds from issuance of long-term debt	7,919	3,458
Repayments of long-term debt	(10,493)	(8,350)
Derivative settlements	7	25
Dividends paid	(1,980)	(1,952)
Proceeds from exercise of stock options	249	183
Payments for taxes related to net share settlement of equity awards	(75)	(85)
Other	(33)	11
Net cash used in financing activities	(4,420)	(6,410)
Net increase in cash, cash equivalents and restricted cash	3,578	1,174
Cash, cash equivalents and restricted cash at the beginning of the period	5,954	4,295
Cash, cash equivalents and restricted cash at the end of the period	9,532	5,469
Reconciliation of net income to net cash provided by operating activities:
Net income	6,217	4,887
Adjustments required to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,302	3,275
Stock-based compensation	288	355
(Gain) loss on sale of subsidiary	(271)	205
Loss on early extinguishment of debt	766	79
Deferred income taxes and other noncash items	(25)	(38)
Change in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	(3,564)	(2,312)
Inventories	45	413
Other assets	(211)	(374)
Accounts payable and pharmacy claims and discounts payable	3,495	2,330
Health care costs payable and other insurance liabilities	(474)	535
Other liabilities	$ 2,730	$ 859