Capital Stock (Common Stock Narrative) (Details) - USD ($)	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021	Sep. 15, 2011
Equity [Abstract]
Common stock, authorized shares	300,000,000
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares issued	249,455,584	249,455,584
Common stock, shares outstanding	222,372,418	222,199,845	221,838,696	221,396,755
Share repurchase program authorized amount					$ 1,000,000,000.0
Share repurchase authorization remaining amount	$ 485,300,000