10-Q Segment Information (Reconciliation Of Income Before Income Tax Expense To Reportable Segments Operating Gain Included In The Consolidated 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
Segment Reporting [Abstract]
Income before income tax expense	$ 1,654	$ 2,127	$ 6,714	$ 6,555	$ 7,600	$ 7,995	$ 6,238
Net investment income	(493)	(371)	(1,296)	(1,112)	(1,485)	(1,378)	(877)
Net losses (gains) on financial instruments	124	57	358	439	550	(318)	(182)
Interest expense	259	213	771	622	851	798	784
Amortization of other intangible assets	212	225	668	520	767	441	361
Reportable segments operating gain	$ 1,756	$ 2,251	$ 7,215	$ 7,024	$ 8,283	$ 7,559	$ 6,360