MEDICARE PART D (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Other current assets	$ 5,843	$ 6,631
Trade accounts payable and accrued expenses	(6,527)	(6,569)
Other long-term assets	3,723	3,377
Other long-term liabilities	(1,829)	(1,662)
Risk Corridor Settlement
Segment Reporting Information [Line Items]
Other current assets	94	224
Trade accounts payable and accrued expenses	(110)	(232)
Net current liability	(16)	(8)
Other long-term assets	401	17
Other long-term liabilities	(83)	(77)
Net long-term asset (liability)	318	(60)
Total net asset (liability)	302	(68)
CMS Subsidies/ Discounts
Segment Reporting Information [Line Items]
Other current assets	657	514
Trade accounts payable and accrued expenses	(2,317)	(1,825)
Net current liability	(1,660)	(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)	$ (1,660)	$ (1,311)