MEDICARE PART D (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Other current assets	$ 6,633	$ 6,631
Trade accounts payable and accrued expenses	(5,915)	(6,569)
Other long-term assets	3,669	3,377
Other long-term liabilities	(1,770)	(1,662)
Risk Corridor Settlement
Segment Reporting Information [Line Items]
Other current assets	107	224
Trade accounts payable and accrued expenses	(114)	(232)
Net current liability	(7)	(8)
Other long-term assets	298	17
Other long-term liabilities	(62)	(77)
Net long-term asset (liability)	236	(60)
Total net asset (liability)	229	(68)
CMS Subsidies/ Discounts
Segment Reporting Information [Line Items]
Other current assets	846	514
Trade accounts payable and accrued expenses	(1,594)	(1,825)
Net current liability	(748)	(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)	$ (748)	$ (1,311)