Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Cash receipts from customers	$ 209,104	$ 195,554
Cash paid for inventory and prescriptions dispensed by retail network pharmacies	(122,129)	(116,590)
Insurance benefits paid	(46,965)	(40,221)
Cash paid to other suppliers and employees	(21,840)	(22,185)
Interest and investment income received	582	622
Interest paid	(2,095)	(2,517)
Income taxes paid	(2,397)	(2,365)
Net cash provided by operating activities	14,260	12,298
Cash flows from investing activities:
Proceeds from sales and maturities of investments	5,559	3,790
Purchases of investments	(7,417)	(6,377)
Purchases of property and equipment	(1,923)	(1,724)
Acquisitions (net of cash acquired)	(135)	(828)
Proceeds from sale of subsidiary	0	834
Other	95	5
Net cash used in investing activities	(3,821)	(4,300)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	987	7,919
Repayments of long-term debt	(7,823)	(10,493)
Derivative settlements	0	(7)
Dividends paid	(1,965)	(1,980)
Proceeds from exercise of stock options	440	249
Payments for taxes related to net share settlement of equity awards	(161)	(75)
Other	(3)	(33)
Net cash used in financing activities	(8,525)	(4,420)
Net increase in cash, cash equivalents and restricted cash	1,914	3,578
Cash, cash equivalents and restricted cash at the beginning of the period	8,130	5,954
Cash, cash equivalents and restricted cash at the end of the period	10,044	9,532
Reconciliation of net income to net cash provided by operating activities:
Net income	6,602	6,217
Adjustments required to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,397	3,302
Goodwill impairment	431	0
Stock-based compensation	346	288
Gain on sale of subsidiary	0	(271)
Loss on early extinguishment of debt	363	766
Deferred income taxes and other noncash items	(645)	(25)
Change in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	(3,504)	(3,564)
Inventories	1,097	45
Other assets	(32)	(211)
Accounts payable and pharmacy claims and discounts payable	3,973	3,495
Health care costs payable and other insurance liabilities	348	(474)
Other liabilities	1,884	2,730
Net cash provided by operating activities	$ 14,260	$ 12,298