SCHEDULE I - PARENT COMPANY FINANCIAL INFORMATION (Condensed Statements of Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Condensed Financial Statements, Captions [Line Items]
Net income attributable to Humana	$ 2,489	$ 2,806	$ 2,933
Other comprehensive income (loss):
Change in gross unrealized investment gains (losses)	372	(1,819)	(356)
Effect of income taxes	(85)	418	81
Total change in unrealized investment gains (losses), net of tax	287	(1,401)	(275)
Reclassification adjustment for net realized losses (gains) included in investment income	25	72	(103)
Effect of income taxes	(7)	(17)	23
Total reclassification adjustment, net of tax	18	55	(80)
Other comprehensive income (loss), net of tax	305	(1,346)	(355)
Comprehensive income attributable to equity method investments	0	0	6
Comprehensive income attributable to Humana	2,794	1,460	2,584
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net income attributable to Humana	2,489	2,806	2,933
Other comprehensive income (loss):
Change in gross unrealized investment gains (losses)	372	(1,819)	(356)
Effect of income taxes	(85)	418	81
Total change in unrealized investment gains (losses), net of tax	287	(1,401)	(275)
Reclassification adjustment for net realized losses (gains) included in investment income	25	72	(103)
Effect of income taxes	(7)	(17)	23
Total reclassification adjustment, net of tax	18	55	(80)
Other comprehensive income (loss), net of tax	305	(1,346)	(355)
Comprehensive income attributable to equity method investments	0	0	6
Comprehensive income attributable to Humana	$ 2,794	$ 1,460	$ 2,584