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Debt - Senior Notes (Details) - USD ($) $ in Millions		3 Months Ended
Debt - Senior Notes (Details) - USD ($) $ in Millions	Dec. 10, 2021	Sep. 30, 2024	Sep. 30, 2023
Senior Notes \| 5.000% Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	5.00%	5.00%
Aggregate principal amount of bridge loan	$ 990
Interest expense incurred		$ 13	$ 13
Senior Notes \| 5.000% Senior Notes \| Senior Notes, Redemption, Period One
Debt Instrument [Line Items]
Redemption price, percentage of principal amount	100.00%
Senior Notes \| 5.000% Senior Notes \| Senior Notes, Redemption, Period Two
Debt Instrument [Line Items]
Redemption percentage	40.00%
Senior Notes \| 5.000% Senior Notes \| Senior Notes, Redemption, Period Three
Debt Instrument [Line Items]
Redemption price, percentage of principal amount	105.00%
Line of credit \| Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Available credit under lines of credit		$ 320