MEDICARE PART D (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Other current assets	$ 5,758	$ 5,567
Trade accounts payable and accrued expenses	(7,431)	(5,238)
Other long-term assets	3,580	3,380
Other long-term liabilities	(1,457)	(1,473)
Risk Corridor Settlement
Segment Reporting Information [Line Items]
Other current assets	86	240
Trade accounts payable and accrued expenses	(147)	(166)
Net current (liability) asset	(61)	74
Other long-term assets	307	19
Other long-term liabilities	(93)	(78)
Net long-term asset (liability)	214	(59)
Total net asset (liability)	153	15
CMS Subsidies/ Discounts
Segment Reporting Information [Line Items]
Other current assets	239	696
Trade accounts payable and accrued expenses	(3,805)	(1,236)
Net current (liability) asset	(3,566)	(540)
Other long-term assets	0	0
Other long-term liabilities	0	0
Net long-term asset (liability)	0	0
Total net asset (liability)	$ (3,566)	$ (540)