Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income attributable to Humana	$ 930	$ 828
Other comprehensive income:
Change in gross unrealized investment (losses) gains	(769)	(320)
Effect of income taxes	176	73
Total change in unrealized investment (losses) gains, net of tax	(593)	(247)
Reclassification adjustment for net realized gains	(27)	(55)
Effect of income taxes	6	13
Total reclassification adjustment, net of tax	(21)	(42)
Other comprehensive loss, net of tax	(614)	(289)
Comprehensive (loss) income attributable to equity method investments	0	6
Comprehensive income attributable to Humana	$ 316	$ 545