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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, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Accelerated Share Repurchases [Line Items]
Common shares issued	32,458	16,935	110,807	144,514
Stock based compensation employee withholding taxes	$ 1	$ 1	$ 4	$ 10
Common shares repurchased	0	1,488,251	1,238,212	1,488,251
Excise tax on stock repurchases	$ 0	$ 1	$ 1	$ 1

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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