10-K Income Taxes (Components Of Provision For Income Taxes) (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
Current tax expense:
Federal					$ 1,469	$ 1,467	$ 1,724
Current Foreign Tax Expense (Benefit)					98	18	7
State and local					179	165	461
Current Income Tax Expense (Benefit)					1,746	1,650	2,192
Deferred tax expense (benefit)					(34)	196	(526)
Total income tax expense	$ 354	$ 529	$ 1,554	$ 1,544	$ 1,712	$ 1,846	$ 1,666