SEGMENT INFORMATION - Schedule of Segment Reporting Information, By Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Premiums revenue	$ 112,104	$ 101,272	$ 87,712
Services revenue	4,431	4,033	4,776
Total revenues	117,761	106,374	92,870
Investment income	1,226	1,069	382
Benefits	100,664	88,394	75,690
Operating costs	13,696	13,188	12,671
Depreciation and amortization	839	779	709
Total operating expenses	115,199	102,361	89,070
Income (loss) from operations	2,562	4,013	3,800
Products
Segment Reporting Information [Line Items]
Premiums revenue	112,104	101,272	87,712
Services
Segment Reporting Information [Line Items]
Services revenue	4,431	4,033	4,776
External Revenues
Segment Reporting Information [Line Items]
Total revenues	116,535	105,305	92,488
Operating Segments | Insurance
Segment Reporting Information [Line Items]
Total revenues	113,764	102,854	88,841
Investment income	690	551	223
Benefits	101,299	89,100	75,934
Operating costs	10,443	10,408	9,251
Depreciation and amortization	733	692	634
Total operating expenses	112,475	100,200	85,819
Income (loss) from operations	1,289	2,654	3,022
Operating Segments | CenterWell
Segment Reporting Information [Line Items]
Total revenues	19,936	18,405	17,307
Investment income	0	0	8
Benefits	0	0	0
Operating costs	18,383	16,791	15,835
Depreciation and amortization	224	210	181
Total operating expenses	18,607	17,001	16,016
Income (loss) from operations	1,329	1,404	1,291
Operating Segments | Products | Insurance
Segment Reporting Information [Line Items]
Premiums revenue	112,104	101,272	87,712
Operating Segments | Products | CenterWell
Segment Reporting Information [Line Items]
Premiums revenue	0	0	0
Operating Segments | Services | Insurance
Segment Reporting Information [Line Items]
Services revenue	966	1,000	850
Operating Segments | Services | CenterWell
Segment Reporting Information [Line Items]
Services revenue	3,465	3,033	3,926
Operating Segments | External Revenues | Insurance
Segment Reporting Information [Line Items]
Total revenues	113,070	102,272	88,562
Operating Segments | External Revenues | CenterWell
Segment Reporting Information [Line Items]
Total revenues	3,465	3,033	3,926
Eliminations/ Corporate
Segment Reporting Information [Line Items]
Total revenues	(15,939)	(14,885)	(13,278)
Investment income	536	518	151
Benefits	(635)	(706)	(244)
Operating costs	(15,130)	(14,011)	(12,415)
Depreciation and amortization	(118)	(123)	(106)
Total operating expenses	(15,883)	(14,840)	(12,765)
Income (loss) from operations	(56)	(45)	(513)
Eliminations/ Corporate | Insurance
Segment Reporting Information [Line Items]
Total revenues	4	31	56
Eliminations/ Corporate | CenterWell
Segment Reporting Information [Line Items]
Total revenues	16,471	15,372	13,373
Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenues	$ (16,475)	$ (15,403)	$ (13,429)