Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Premiums	$ 19,885	$ 18,904	$ 59,987	$ 55,822
Services	845	457	1,802	1,331
Investment (loss) income	(33)	714	221	940
Total revenues	20,697	20,075	62,010	58,093
Operating expenses:
Benefits	17,316	15,611	51,761	45,415
Operating costs	2,603	2,513	6,726	6,984
Depreciation and amortization	150	128	436	362
Total operating expenses	20,069	18,252	58,923	52,761
Income from operations	628	1,823	3,087	5,332
Interest expense	88	75	235	211
Other (income) expense, net	(1,096)	(7)	(562)	63
Income before income taxes and equity in net earnings	1,636	1,755	3,414	5,058
Provision for income taxes	120	450	536	1,485
Equity in net earnings	15	35	69	68
Net income	1,531	1,340	2,947	3,641
Less: Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to Humana	$ 1,531	$ 1,340	$ 2,947	$ 3,641
Basic earnings per common share (in dollars per share)	$ 11.91	$ 10.12	$ 22.90	$ 27.53
Diluted earnings per common share (in dollars per share)	$ 11.84	$ 10.05	$ 22.77	$ 27.37
Services revenue, type	Health Care [Member]	Health Care [Member]	Health Care [Member]	Health Care [Member]