Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net income	$ 2,934	$ 3,367	$ 2,707
Adjustments to reconcile net income to net cash provided by operating activities:
Loss (gain) on investment securities, net	130	(838)	(62)
Gain on Kindred at Home equity method investment	(1,129)	0	0
Equity in net earnings	(65)	(74)	(14)
Stock compensation	180	181	163
Depreciation	640	528	505
Amortization	73	88	70
Provision for deferred income taxes	15	195	162
Changes in operating assets and liabilities, net of effect of businesses acquired and dispositions:
Receivables	(280)	(85)	(32)
Other assets	(491)	(581)	118
Benefits payable	104	2,139	1,142
Other liabilities	176	599	471
Unearned revenues	(65)	71	(36)
Other	40	49	90
Net cash provided by operating activities	2,262	5,639	5,284
Cash flows from investing activities
Acquisitions, net of cash and cash equivalents acquired	(4,187)	(709)	0
Purchases of property and equipment, net	(1,316)	(964)	(736)
Purchases of investment securities	(7,197)	(9,125)	(6,361)
Proceeds from maturities of investment securities	2,597	4,986	1,733
Proceeds from sales of investment securities	3,547	2,747	4,086
Net cash used in investing activities	(6,556)	(3,065)	(1,278)
Cash flows from financing activities
Withdrawals receipts from contract deposits, net	(306)	(939)	(623)
Proceeds from issuance of senior notes, net	2,984	1,088	987
Repayment of senior notes	0	(400)	(400)
Proceeds (repayments) from issuance of commercial paper, net	352	295	(360)
Proceeds from term loan	2,500	1,000	0
Repayment of term loan	(2,078)	(1,000)	(650)
Debt issue costs	(31)	0	0
Common stock repurchases	(79)	(1,820)	(1,070)
Dividends paid	(354)	(323)	(291)
Change in book overdraft	6	95	54
Proceeds from stock option exercises & other	21	49	58
Net cash provided by (used in) financing activities	3,015	(1,955)	(2,295)
(Decrease) increase in cash and cash equivalents	(1,279)	619	1,711
Cash and cash equivalents at beginning of period	4,673	4,054	2,343
Cash and cash equivalents at end of period	3,394	4,673	4,054
Supplemental cash flow disclosures:
Interest payments	285	258	212
Income tax payments, net	227	1,132	518
Details of businesses acquired in purchase transactions:
Fair value of assets acquired, net of cash acquired	9,804	819	28
Less: Fair value of liabilities assumed	(3,235)	(110)	(28)
Less: Noncontrolling interests acquired	(22)	0	0
Less: Remeasured existing Kindred at Home equity method investment	(2,360)	0	0
Cash paid for acquired businesses, net of cash acquired	$ 4,187	$ 709	$ 0