Equity Items - Summary of Reconciliation of Changes in Stockholders' Equity (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Accelerated Share Repurchases [Line Items]
Common shares issued	11,423	18,909	139,824	129,716
Stock based compensation employee withholding taxes	$ 1	$ 1	$ 4	$ 5
Common shares repurchased	0	1,314,485	1,541,320	2,552,697
Stock repurchase during period value	$ 0	$ 130	$ 100	$ 230
Excise tax on stock repurchases	$ 0	$ 1	$ 1	$ 2

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References + Details