10-Q Income Taxes (Narrative) (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
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent	21.40%	24.90%	23.10%	23.60%	22.50%	23.10%	26.70%
Income tax expense	$ 354	$ 529	$ 1,554	$ 1,544	$ 1,712	$ 1,846	$ 1,666
Income Taxes Receivable	258		258		440	$ 173
Income Taxes Receivable, Current	183		183		$ 440
Income Taxes Receivable, Noncurrent	$ 75		$ 75