MEDICARE PART D (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Other current assets	$ 6,676	$ 6,631
Trade accounts payable and accrued expenses	(5,259)	(6,569)
Other long-term assets	3,383	3,377
Other long-term liabilities	(1,951)	(1,662)
Risk Corridor Settlement
Segment Reporting Information [Line Items]
Other current assets	190	224
Trade accounts payable and accrued expenses	(83)	(232)
Net current asset (liability)	107	(8)
Other long-term assets	58	17
Other long-term liabilities	(39)	(77)
Net long-term asset (liability)	19	(60)
Total net asset (liability)	126	(68)
CMS Subsidies/ Discounts
Segment Reporting Information [Line Items]
Other current assets	1,203	514
Trade accounts payable and accrued expenses	(673)	(1,825)
Net current asset (liability)	530	(1,311)
Other long-term assets	0	0
Other long-term liabilities	0	0
Net long-term asset (liability)	0	0
Total net asset (liability)	$ 530	$ (1,311)