MEDICARE PART D (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Other current assets	$ 5,865	$ 5,567
Trade accounts payable and accrued expenses	(8,118)	(5,238)
Other long-term assets	3,726	3,380
Other long-term liabilities	(1,563)	(1,473)
Risk Corridor Settlement
Segment Reporting Information [Line Items]
Other current assets	131	240
Trade accounts payable and accrued expenses	(157)	(166)
Net current (liability) asset	(26)	74
Other long-term assets	369	19
Other long-term liabilities	(112)	(78)
Net long-term asset (liability)	257	(59)
Total net asset (liability)	231	15
CMS Subsidies/ Discounts
Segment Reporting Information [Line Items]
Other current assets	200	696
Trade accounts payable and accrued expenses	(4,277)	(1,236)
Net current (liability) asset	(4,077)	(540)
Other long-term assets	0	0
Other long-term liabilities	0	0
Net long-term asset (liability)	0	0
Total net asset (liability)	$ (4,077)	$ (540)