MEDICARE PART D (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Other current assets	$ 5,567	$ 6,493
Trade accounts payable and accrued expenses	(5,238)	(4,509)
Other long-term assets	3,380	4,379
Other long-term liabilities	(1,473)	(2,383)
Risk Corridor Settlement
Segment Reporting Information [Line Items]
Other current assets	240	363
Trade accounts payable and accrued expenses	(166)	(68)
Net current asset (liability)	74	295
Other long-term assets	19	5
Other long-term liabilities	(78)	(194)
Net long-term liability	(59)	(189)
Total net asset (liability)	15	106
CMS Subsidies/ Discounts
Segment Reporting Information [Line Items]
Other current assets	696	1,894
Trade accounts payable and accrued expenses	(1,236)	(466)
Net current asset (liability)	(540)	1,428
Other long-term assets	0	0
Other long-term liabilities	0	0
Net long-term liability	0	0
Total net asset (liability)	$ (540)	$ 1,428