Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Cash receipts from customers	$ 74,192	$ 66,487
Cash paid for inventory and prescriptions dispensed by retail network pharmacies	(44,365)	(39,171)
Insurance benefits paid	(16,616)	(15,456)
Cash paid to other suppliers and employees	(8,969)	(8,270)
Interest and investment income received	199	222
Interest paid	(782)	(876)
Income taxes paid	(96)	(44)
Net cash provided by operating activities	3,563	2,892
Cash flows from investing activities:
Proceeds from sales and maturities of investments	2,570	2,177
Purchases of investments	(3,474)	(3,131)
Purchases of property and equipment	(1,051)	(829)
Acquisitions (net of cash acquired)	(7)	(84)
Other	(31)	0
Net cash used in investing activities	(1,993)	(1,867)
Cash flows from financing activities:
Net borrowings of short-term debt	0	252
Repayments of long-term debt	(14)	(3,049)
Repurchase of common stock	(2,000)	0
Dividends paid	(722)	(656)
Proceeds from exercise of stock options	297	212
Payments for taxes related to net share settlement of equity awards	(62)	(3)
Other	(149)	59
Net cash used in financing activities	(2,650)	(3,185)
Net decrease in cash, cash equivalents and restricted cash	(1,080)	(2,160)
Cash, cash equivalents and restricted cash at the beginning of the period	12,691	11,043
Cash, cash equivalents and restricted cash at the end of the period	11,611	8,883
Reconciliation of net income to net cash provided by operating activities:
Net income	2,313	2,224
Adjustments required to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,055	1,126
Stock-based compensation	89	87
Deferred income taxes and other noncash items	(187)	(166)
Change in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	(1,967)	(2,093)
Inventories	(400)	879
Other assets	(352)	(286)
Accounts payable and pharmacy claims and discounts payable	1,974	576
Health care costs payable and other insurance liabilities	1,478	294
Other liabilities	(440)	251
Net cash provided by operating activities	$ 3,563	$ 2,892