Derivatives - Schedule of Consolidated Balance Sheet Classification of Derivatives (Details) - USD ($) $ in Millions	Sep. 30, 2026	Jun. 30, 2026
Derivative [Line Items]
Derivative assets - Current	$ 8	$ 0
Asset	410	415
Derivative assets - Non-current	402	416
Derivatives not designated as hedging instruments:
Derivative [Line Items]
Asset	410	416
Liability	0	0
Interest-rate Swaps
Derivative [Line Items]
Asset	26	3
Interest-rate Swaps \| Derivatives designated as hedging instruments:
Derivative [Line Items]
Derivative assets - Current	8	0
Derivative liability - Current	0	0
Derivative assets - Non-current	18	3
Derivative liability - Noncurrent	0	0
Capped Call Transactions
Derivative [Line Items]
Asset	384	412
Capped Call Transactions \| Derivatives not designated as hedging instruments:
Derivative [Line Items]
Derivative assets - Non-current	384	412
Derivative liability - Noncurrent	$ 0	$ 0

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