10-Q Consolidated Statements Of Income - USD ($) $ in Millions	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues
Premiums	$ 35,259			$ 33,722			$ 107,716	$ 99,583	$ 133,229	$ 117,373	$ 104,109
Product revenue	5,177			3,972			14,058	10,841	14,978	12,657	10,384
Service fees	2,044			1,931			5,981	5,569	7,453	6,913	6,315
Total operating revenue	42,480			39,625			127,755	115,993	155,660	136,943	120,808
Net investment income	493			371			1,296	1,112	1,485	1,378	877
Net losses on financial instruments	(124)			(57)			(358)	(439)	(550)	318	182
Total revenues	42,849			39,939			128,693	116,666	156,595	138,639	121,867
Expenses
Benefit expense	30,606	$ 31,604	$ 30,786	29,421	$ 28,795	$ 28,231	92,996	86,447	116,642	102,571	88,045
Cost of products sold	4,648			3,437			12,456	9,389	13,035	10,895	8,953
Operating expense	5,470			4,516			15,088	13,133	17,700	15,918	17,450
Interest expense	259			213			771	622	851	798	784
Amortization of other intangible assets	212			225			668	520	767	441	361
Total expenses	41,195			37,812			121,979	110,111	148,995	130,644	115,629
Income before income tax expense	1,654			2,127			6,714	6,555	7,600	7,995	6,238
Income tax expense	354			529			1,554	1,544	1,712	1,846	1,666
Net income	1,300	$ 1,856	$ 2,004	1,598	$ 1,634	$ 1,779	5,160	5,011	5,888	6,149	4,572
Net (income) loss attributable to noncontrolling interests	(11)			5			(29)	18	6	9	0
Shareholders’ net income	$ 1,289			$ 1,603			$ 5,131	$ 5,029	$ 5,894	$ 6,158	$ 4,572
Shareholders’ net income per share
Basic net income per share	$ 5.48			$ 6.69			$ 21.70	$ 20.91	$ 24.56	$ 25.26	$ 18.23
Diluted net income per share	5.45			6.62			21.56	20.67	24.28	24.95	17.98
Dividends per share	$ 1.48			$ 1.28			$ 4.44	$ 3.84	$ 5.12	$ 4.52	$ 3.80