Goodwill And Other Intangible Assets (Summary Of The Change In The Carrying Amount Of Goodwill By Reportable Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Change in the carrying amount of goodwill by reportable segment
Goodwill, Beginning Balance	$ 24,228	$ 21,691
Adjustments	155	2,537
Goodwill, Ending Balance	24,383	24,228
Accumulated impairment as of December 31	0
Commercial and Specialty Business [Member]
Change in the carrying amount of goodwill by reportable segment
Goodwill, Beginning Balance	11,593	11,593
Adjustments	18	0
Goodwill, Ending Balance	11,611	11,593
Accumulated impairment as of December 31	0
Government Business [Member]
Change in the carrying amount of goodwill by reportable segment
Goodwill, Beginning Balance	10,349	8,331
Adjustments	128	2,018
Goodwill, Ending Balance	10,477	10,349
Accumulated impairment as of December 31	0
CarelonRx Segment [Member]
Change in the carrying amount of goodwill by reportable segment
Goodwill, Beginning Balance	59	48
Adjustments	0	11
Goodwill, Ending Balance	59	59
Accumulated impairment as of December 31	0
Other [Member]
Change in the carrying amount of goodwill by reportable segment
Goodwill, Beginning Balance	2,227	1,719
Adjustments	9	508
Goodwill, Ending Balance	2,236	$ 2,227
Accumulated impairment as of December 31	$ 0