SEGMENT INFORMATION - Schedule of Segment Reporting Information, By Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenues:
Premiums revenue	$ 122,825	$ 112,104	$ 101,272
Services revenue	5,833	4,431	4,033
Total revenues	129,664	117,761	106,374
Investment income	1,006	1,226	1,069
Operating expenses:
Benefits	110,812	100,664	88,394
Operating costs	15,450	13,696	13,188
Depreciation and amortization	698	839	779
Total operating expenses	126,960	115,199	102,361
Income (loss) from operations	2,704	2,562	4,013
External Revenues
Revenues:
Total revenues	128,658	116,535	105,305
Products
Revenues:
Premiums revenue	122,825	112,104	101,272
Services
Revenues:
Services revenue	5,833	4,431	4,033
Operating Segments | Insurance
Revenues:
Total revenues	124,563	113,764	102,854
Investment income	717	690	551
Operating expenses:
Benefits	111,043	101,299	89,100
Operating costs	11,260	10,443	10,408
Depreciation and amortization	596	733	692
Total operating expenses	122,899	112,475	100,200
Income (loss) from operations	1,664	1,289	2,654
Operating Segments | CenterWell
Revenues:
Total revenues	22,473	19,936	18,405
Investment income	0	0	0
Operating expenses:
Benefits	0	0	0
Operating costs	20,915	18,383	16,791
Depreciation and amortization	219	224	210
Total operating expenses	21,134	18,607	17,001
Income (loss) from operations	1,339	1,329	1,404
Operating Segments | External Revenues | Insurance
Revenues:
Total revenues	123,842	113,070	102,272
Operating Segments | External Revenues | CenterWell
Revenues:
Total revenues	4,816	3,465	3,033
Operating Segments | Products | Insurance
Revenues:
Premiums revenue	122,825	112,104	101,272
Operating Segments | Products | CenterWell
Revenues:
Premiums revenue	0	0	0
Operating Segments | Services | Insurance
Revenues:
Services revenue	1,017	966	1,000
Operating Segments | Services | CenterWell
Revenues:
Services revenue	4,816	3,465	3,033
Eliminations/ Corporate
Revenues:
Total revenues	(17,372)	(15,939)	(14,885)
Investment income	289	536	518
Operating expenses:
Benefits	(231)	(635)	(706)
Operating costs	(16,725)	(15,130)	(14,011)
Depreciation and amortization	(117)	(118)	(123)
Total operating expenses	(17,073)	(15,883)	(14,840)
Income (loss) from operations	(299)	(56)	(45)
Eliminations/ Corporate | Insurance
Revenues:
Total revenues	4	4	31
Eliminations/ Corporate | CenterWell
Revenues:
Total revenues	17,657	16,471	15,372
Intersegment Eliminations
Revenues:
Total revenues	$ (17,661)	$ (16,475)	$ (15,403)