EQUITY METHOD INVESTMENT - Summarized Balance Sheets and Statements of Income (Details) - USD ($) $ in Millions	5 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Balance sheet
Current assets	$ 26,183	$ 29,986	$ 26,183
Current liabilities	17,178	18,872	17,178
Shareholders' equity	15,311	16,262	15,311
Income Statement Related Disclosures [Abstract]
Revenues		106,374	92,870	$ 83,064
Net income attributable to Humana		2,489	2,806	$ 2,933
Kindred at Home
Balance sheet
Current assets	297	415	297
Non-current assets	3,577	4,260	3,577
Current liabilities	269	409	269
Non-current liabilities	2,219	2,719	2,219
Shareholders' equity	1,386	1,547	$ 1,386
Income Statement Related Disclosures [Abstract]
Revenues	654	1,850
Expenses	652	1,873
Net income attributable to Humana	$ 2	$ (23)