Segment Information (Financial Data By Reportable Segment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Premiums	$ 36,589	$ 33,076	$ 72,457	$ 65,861
Product revenue	4,859	3,568	8,881	6,869
Service fees	1,929	1,838	3,937	3,638
Total operating revenue	43,377	38,482	85,275	76,368
Operating gain (loss)	2,628	2,346	5,459	4,773
Health Benefits Segment
Segment Reporting Information [Line Items]
Premiums	36,233	32,787	71,767	65,250
Product revenue	0	0	0	0
Service fees	1,767	1,609	3,513	3,173
Total operating revenue	38,000	34,396	75,280	68,423
Operating gain (loss)	2,148	1,781	4,307	3,632
Carelon Total
Segment Reporting Information [Line Items]
Premiums	429	327	839	693
Product revenue	4,859	3,568	8,881	6,869
Service fees	201	220	408	446
Total operating revenue	11,907	10,054	23,243	19,685
Operating gain (loss)	632	592	1,353	1,190
Carelon Services Segment
Segment Reporting Information [Line Items]
Premiums	429	327	839	693
Product revenue	0	0	0	0
Service fees	201	220	408	446
Total operating revenue	3,441	2,983	6,753	5,931
Operating gain (loss)	136	113	345	313
CarelonRx Segment [Member]
Segment Reporting Information [Line Items]
Premiums	0	0	0	0
Product revenue	4,859	3,568	8,881	6,869
Service fees	0	0	0	0
Total operating revenue	8,466	7,071	16,490	13,754
Operating gain (loss)	496	479	1,008	877
Corporate & Other Segment
Segment Reporting Information [Line Items]
Premiums	0	0	0	0
Product revenue	0	0	0	0
Service fees	(39)	9	16	19
Total operating revenue	287	315	538	588
Operating gain (loss)	(152)	(27)	(201)	(49)
Segment Eliminations [Member]
Segment Reporting Information [Line Items]
Premiums	(73)	(38)	(149)	(82)
Total operating revenue	(6,817)	(6,283)	(13,786)	(12,328)
Operating gain (loss)	0	0	0	0
Unaffiliated
Segment Reporting Information [Line Items]
Total operating revenue	43,377	38,482	85,275	76,368
Unaffiliated | Health Benefits Segment
Segment Reporting Information [Line Items]
Total operating revenue	38,000	34,396	75,280	68,423
Unaffiliated | Carelon Total
Segment Reporting Information [Line Items]
Total operating revenue	5,489	4,115	10,128	8,008
Unaffiliated | Carelon Services Segment
Segment Reporting Information [Line Items]
Total operating revenue	630	547	1,247	1,139
Unaffiliated | CarelonRx Segment [Member]
Segment Reporting Information [Line Items]
Total operating revenue	4,859	3,568	8,881	6,869
Unaffiliated | Corporate & Other Segment
Segment Reporting Information [Line Items]
Total operating revenue	(39)	9	16	19
Unaffiliated | Segment Eliminations [Member]
Segment Reporting Information [Line Items]
Total operating revenue	(73)	(38)	(149)	(82)
Affiliated [Member] | Carelon Total
Segment Reporting Information [Line Items]
Total operating revenue	6,418	5,939	13,115	11,677
Affiliated [Member] | Carelon Services Segment
Segment Reporting Information [Line Items]
Total operating revenue	2,811	2,436	5,506	4,792
Affiliated [Member] | CarelonRx Segment [Member]
Segment Reporting Information [Line Items]
Total operating revenue	3,607	3,503	7,609	6,885
Affiliated [Member] | Corporate & Other Segment
Segment Reporting Information [Line Items]
Total operating revenue	326	306	522	569
Affiliated [Member] | Segment Eliminations [Member]
Segment Reporting Information [Line Items]
Total operating revenue	$ (6,744)	$ (6,245)	$ (13,637)	$ (12,246)