10-Q Segment Information (Reconciliation Of Reportable Segments Operating Revenues To Total Revenues Reported 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]
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