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Stockholders' Deficit - Narrative (Details) $ / shares in Units, $ in Millions		3 Months Ended			12 Months Ended	15 Months Ended
	Oct. 30, 2024 USD ($)	Sep. 30, 2025 $ / shares	Jun. 30, 2025 USD ($) vote $ / shares	Jun. 30, 2024 USD ($) $ / shares	Mar. 31, 2025 USD ($)	Jun. 30, 2025 USD ($) vote
Dividends Payable [Line Items]
Number of votes per share of common stock permitted on proposals presented to stockholders (vote) | vote			1			1
Cash dividends declared, per common share (in dollars per share) | $ / shares			$ 0.71	$ 0.62
Excise taxes					$ 26	$ 28
Excise tax payment	$ 25
Share Repurchase Transactions
Dividends Payable [Line Items]
Excise taxes			$ 2	$ 1
Forecast
Dividends Payable [Line Items]
Cash dividends declared, per common share (in dollars per share) | $ / shares		$ 0.82

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

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