SCHEDULE I - PARENT COMPANY FINANCIAL INFORMATION (Condensed Statements of Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]
Net income attributable to Humana	$ 2,806	$ 2,933	$ 3,367
Other comprehensive income (loss):
Change in gross unrealized investment (losses) gains	(1,819)	(356)	393
Effect of income taxes	418	81	(89)
Total change in unrealized investment (losses) gains, net of tax	(1,401)	(275)	304
Reclassification adjustment for net realized losses (gains) included in investment income	72	(103)	(90)
Effect of income taxes	(17)	23	20
Total reclassification adjustment, net of tax	55	(80)	(70)
Other comprehensive (loss) income, net of tax	(1,346)	(355)	234
Comprehensive income attributable to equity method investments	0	6	1
Comprehensive income attributable to Humana	1,460	2,584	3,602
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net income attributable to Humana	2,806	2,933	3,367
Other comprehensive income (loss):
Change in gross unrealized investment (losses) gains	(1,819)	(356)	393
Effect of income taxes	418	81	(89)
Total change in unrealized investment (losses) gains, net of tax	(1,401)	(275)	304
Reclassification adjustment for net realized losses (gains) included in investment income	72	(103)	(90)
Effect of income taxes	(17)	23	20
Total reclassification adjustment, net of tax	55	(80)	(70)
Other comprehensive (loss) income, net of tax	(1,346)	(355)	234
Comprehensive income attributable to equity method investments	0	6	1
Comprehensive income attributable to Humana	$ 1,460	$ 2,584	$ 3,602