Schedule II-Condensed Financial Information Of Registrant (Statements Of Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net investment income	$ 493	$ 371	$ 1,296	$ 1,112	$ 1,485	$ 1,378	$ 877
Service fees	2,044	1,931	5,981	5,569	7,453	6,913	6,315
Total revenues	42,849	39,939	128,693	116,666	156,595	138,639	121,867
Interest expense	259	213	771	622	851	798	784
Loss on extinguishment of debt					0	21	36
Shareholders' net income	$ 1,289	$ 1,603	$ 5,131	$ 5,029	5,894	6,158	4,572
Anthem, Inc. [Member]
Net investment income					4	6	65
Net (losses) gains on financial instruments					2	6	28
Service fees					7	24	22
Total revenues					13	36	115
General and administrative expense					188	119	169
Interest expense					845	794	779
Loss on extinguishment of debt					0	21	36
Total expenses					1,033	934	984
Income before income tax expense					(1,020)	(898)	(869)
Income tax credits					(461)	(244)	(386)
Equity in net income of subsidiaries					6,453	6,812	5,055
Shareholders' net income					$ 5,894	$ 6,158	$ 4,572