Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities
Net income attributable to Humana	$ 930	$ 828
Adjustments to reconcile net income to net cash provided by operating activities:
Losses (gains) on investment securities, net	76	(10)
Equity in net losses (earnings)	4	(21)
Stock-based compensation	43	39
Depreciation	181	153
Amortization	24	15
Changes in operating assets and liabilities, net of effect of businesses acquired:
Receivables	(1,360)	(1,049)
Other assets	(628)	(1,095)
Benefits payable	1,089	466
Other liabilities	(103)	(151)
Unearned revenues	34	7
Other	12	(19)
Net cash provided by (used in) operating activities	302	(837)
Cash flows from investing activities
Acquisitions, net of cash and cash equivalents acquired	(74)	(123)
Purchases of property and equipment, net	(295)	(290)
Purchases of investment securities	(2,161)	(3,720)
Proceeds from maturities of investment securities	588	692
Proceeds from sales of investment securities	1,294	1,953
Net cash used in investing activities	(648)	(1,488)
Cash flows from financing activities
Receipts from contract deposits, net	2,475	1,015
Proceeds from issuance of senior notes, net	744	0
(Repayments) proceeds from issuance of commercial paper, net	(265)	603
Debt issue costs	(1)	0
Change in book overdraft	(9)	23
Common stock repurchases	(1,024)	(30)
Dividends paid	(91)	(83)
Other	(13)	1
Net cash provided by financing activities	1,816	1,529
Increase (decrease) in cash and cash equivalents	1,470	(796)
Cash and cash equivalents at beginning of period	3,394	4,673
Cash and cash equivalents at end of period	4,864	3,877
Supplemental cash flow disclosures:
Interest payments	67	40
Income tax payments, net	(20)	(1)
Details of businesses acquired in purchase transactions:
Fair value of assets acquired, net of cash and cash equivalents acquired	84	264
Less: Fair value of liabilities assumed	(10)	(141)
Cash paid for acquired businesses, net of cash and cash equivalents acquired	$ 74	$ 123