MEDICARE PART D (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Other current assets	$ 5,420	$ 6,493
Trade accounts payable and accrued expenses	(6,766)	(4,509)
Other long-term assets	3,627	4,379
Other long-term liabilities	(1,599)	(2,383)
Risk Corridor Settlement
Segment Reporting Information [Line Items]
Other current assets	157	363
Trade accounts payable and accrued expenses	(94)	(68)
Net current asset (liability)	63	295
Other long-term assets	234	5
Other long-term liabilities	(188)	(194)
Net long-term asset (liability)	46	(189)
Total net asset (liability)	109	106
CMS Subsidies/ Discounts
Segment Reporting Information [Line Items]
Other current assets	775	1,894
Trade accounts payable and accrued expenses	(3,074)	(466)
Net current asset (liability)	(2,299)	1,428
Other long-term assets	0	0
Other long-term liabilities	0	0
Net long-term asset (liability)	0	0
Total net asset (liability)	$ (2,299)	$ 1,428