Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Cash receipts from customers	$ 87,798	$ 74,192
Cash paid for prescriptions dispensed and health services rendered	(50,223)	(44,365)
Insurance benefits paid	(19,757)	(16,616)
Cash paid to other suppliers and employees	(9,958)	(8,969)
Interest and investment income received	426	199
Interest paid	(773)	(782)
Income taxes paid	(75)	(96)
Net cash provided by operating activities	7,438	3,563
Cash flows from investing activities:
Proceeds from sales and maturities of investments	1,891	2,570
Purchases of investments	(2,358)	(3,474)
Purchases of property and equipment	(984)	(1,051)
Acquisitions (net of cash acquired)	(7,094)	(7)
Other	31	(31)
Net cash used in investing activities	(8,514)	(1,993)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	5,951	0
Repayments of long-term debt	(362)	(14)
Repurchase of common stock	(2,018)	(2,000)
Dividends paid	(779)	(722)
Proceeds from exercise of stock options	96	297
Payments for taxes related to net share settlement of equity awards	(34)	(62)
Other	(128)	(149)
Net cash provided by (used in) financing activities	2,726	(2,650)
Net increase (decrease) in cash, cash equivalents and restricted cash	1,650	(1,080)
Cash, cash equivalents and restricted cash at the beginning of the period	13,305	12,691
Cash, cash equivalents and restricted cash at the end of the period	14,955	11,611
Reconciliation of net income to net cash provided by operating activities:
Net income	2,142	2,355
Adjustments required to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,001	1,049
Stock-based compensation	103	89
Deferred income taxes and other noncash items	155	(175)
Change in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	(751)	(1,967)
Inventories	828	(400)
Other assets	(1,255)	(348)
Accounts payable and pharmacy claims and discounts payable	(1,203)	1,974
Health care costs payable and other insurance liabilities	4,382	1,430
Other liabilities	2,036	(444)
Net cash provided by operating activities	$ 7,438	$ 3,563