SCHEDULE I - PARENT COMPANY FINANCIAL INFORMATION (Condensed Statements of Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]
Net income attributable to Humana	$ 1,207	$ 2,489	$ 2,806
Other comprehensive (loss) income:
Change in gross unrealized investment (losses) gains	(62)	372	(1,819)
Effect of income taxes	15	(85)	418
Total change in unrealized investment (losses) gains, net of tax	(47)	287	(1,401)
Reclassification adjustment for net realized (gains) losses included in investment income	(27)	25	72
Effect of income taxes	6	(7)	(17)
Total reclassification adjustment, net of tax	(21)	18	55
Other comprehensive (loss) income, net of tax	(68)	305	(1,346)
Comprehensive income attributable to Humana	1,139	2,794	1,460
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net income attributable to Humana	1,207	2,489	2,806
Other comprehensive (loss) income:
Change in gross unrealized investment (losses) gains	(62)	372	(1,819)
Effect of income taxes	15	(85)	418
Total change in unrealized investment (losses) gains, net of tax	(47)	287	(1,401)
Reclassification adjustment for net realized (gains) losses included in investment income	(27)	25	72
Effect of income taxes	6	(7)	(17)
Total reclassification adjustment, net of tax	(21)	18	55
Other comprehensive (loss) income, net of tax	(68)	305	(1,346)
Comprehensive income attributable to Humana	$ 1,139	$ 2,794	$ 1,460