Segment Information (Major Product Revenues) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Major Product Revenue By Segment [Line Items]
Insurance Services Revenue	$ 155,660	$ 136,943	$ 120,808
Commercial and Specialty Business Segment [Member]
Major Product Revenue By Segment [Line Items]
Insurance Services Revenue	41,674	38,809	36,699
Commercial and Specialty Business Segment [Member] | Managed Care Products [Member]
Major Product Revenue By Segment [Line Items]
Insurance Services Revenue	33,927	31,564	29,815
Commercial and Specialty Business Segment [Member] | Managed Care Services [Member]
Major Product Revenue By Segment [Line Items]
Insurance Services Revenue	6,152	5,711	5,296
Commercial and Specialty Business Segment [Member] | Dental Vision Products And Services [Member]
Major Product Revenue By Segment [Line Items]
Insurance Services Revenue	1,434	1,363	1,231
Commercial and Specialty Business Segment [Member] | Other Products [Member]
Major Product Revenue By Segment [Line Items]
Insurance Services Revenue	161	171	357
Government Business Segment [Member]
Major Product Revenue By Segment [Line Items]
Insurance Services Revenue	96,810	82,919	71,572
Government Business Segment [Member] | Managed Care Products [Member]
Major Product Revenue By Segment [Line Items]
Insurance Services Revenue	96,322	82,519	71,188
Government Business Segment [Member] | Managed Care Services [Member]
Major Product Revenue By Segment [Line Items]
Insurance Services Revenue	488	400	384
CarelonRx Segment [Member] | Pharmacy products and services [Member]
Major Product Revenue By Segment [Line Items]
Insurance Services Revenue	28,526	25,431	21,911
Other Segment [Member]
Major Product Revenue By Segment [Line Items]
Insurance Services Revenue	13,294	10,250	6,057
Other Segment [Member] | Other Products [Member]
Major Product Revenue By Segment [Line Items]
Insurance Services Revenue	1,020	605	270
Other Segment [Member] | Integrated health services [Member]
Major Product Revenue By Segment [Line Items]
Insurance Services Revenue	12,274	9,645	5,787
Segment Eliminations [Member]
Major Product Revenue By Segment [Line Items]
Insurance Services Revenue	$ (24,644)	$ (20,466)	$ (15,431)