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Equity Items - Summary of Reconciliation of Changes in Stockholders' Equity (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Equity [Abstract]
Common shares issued	25,386	52,993	78,012	128,401
Number of shares repurchased	0	1,541,320	0	1,541,320
Stock based compensation employee withholding taxes	$ 0	$ 0	$ 2	$ 3
Excise tax on stock repurchases	$ 0	1	$ 0	1
Common shares repurchased, value		$ 100		$ 100

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.

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- 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.

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