Segment Information (Financial Data By Reportable Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Premiums	$ 35,868	$ 32,785
Product revenue	4,022	3,301
Service fees	2,008	1,800
Total operating revenue	41,898	37,886
Operating gain (loss)	2,831	2,427
Health Benefits Segment
Segment Reporting Information [Line Items]
Premiums	35,534	32,463
Product revenue	0	0
Service fees	1,746	1,564
Total operating revenue	37,280	34,027
Operating gain (loss)	2,159	1,851
Carelon Services Segment
Segment Reporting Information [Line Items]
Premiums	410	366
Product revenue	0	0
Service fees	207	226
Total operating revenue	3,312	2,948
Operating gain (loss)	209	200
Carelon Total
Segment Reporting Information [Line Items]
Premiums	410	366
Product revenue	4,022	3,301
Service fees	207	226
Total operating revenue	11,336	9,631
Operating gain (loss)	721	598
Corporate & Other Segment
Segment Reporting Information [Line Items]
Premiums	0	0
Product revenue	0	0
Service fees	55	10
Total operating revenue	251	273
Operating gain (loss)	(49)	(22)
Segment Eliminations [Member]
Segment Reporting Information [Line Items]
Premiums	(76)	(44)
Total operating revenue	(6,969)	(6,045)
Operating gain (loss)	0	0
CarelonRx Segment [Member]
Segment Reporting Information [Line Items]
Premiums	0	0
Product revenue	4,022	3,301
Service fees	0	0
Total operating revenue	8,024	6,683
Operating gain (loss)	512	398
Unaffiliated
Segment Reporting Information [Line Items]
Total operating revenue	41,898	37,886
Unaffiliated | Health Benefits Segment
Segment Reporting Information [Line Items]
Total operating revenue	37,280	34,027
Unaffiliated | Carelon Services Segment
Segment Reporting Information [Line Items]
Total operating revenue	617	592
Unaffiliated | Carelon Total
Segment Reporting Information [Line Items]
Total operating revenue	4,639	3,893
Unaffiliated | Corporate & Other Segment
Segment Reporting Information [Line Items]
Total operating revenue	55	10
Unaffiliated | Segment Eliminations [Member]
Segment Reporting Information [Line Items]
Total operating revenue	(76)	(44)
Unaffiliated | CarelonRx Segment [Member]
Segment Reporting Information [Line Items]
Total operating revenue	4,022	3,301
Affiliated [Member] | Carelon Services Segment
Segment Reporting Information [Line Items]
Total operating revenue	2,695	2,356
Affiliated [Member] | Carelon Total
Segment Reporting Information [Line Items]
Total operating revenue	6,697	5,738
Affiliated [Member] | Corporate & Other Segment
Segment Reporting Information [Line Items]
Total operating revenue	196	263
Affiliated [Member] | Segment Eliminations [Member]
Segment Reporting Information [Line Items]
Total operating revenue	(6,893)	(6,001)
Affiliated [Member] | CarelonRx Segment [Member]
Segment Reporting Information [Line Items]
Total operating revenue	$ 4,002	$ 3,382