10-Q Capital Stock (Schedule Of Weighted-Average Fair Values Determined For The Periods) (Details) - $ / shares	9 Months Ended	12 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Banking Regulation, Total Capital [Abstract]
Options granted during the period	$ 127.08	$ 116.85	$ 116.92	$ 79.91	$ 54.05
Restricted stock awards granted during the period	$ 469.30	$ 453.16	$ 453.70	$ 317.70	$ 272.37

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(01)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration