Financial Instruments - Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 7	$ 24
Derivative Asset, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag	Derivative assets	Derivative assets
Derivative liabilities	$ 64
Derivative Liability, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag	Derivative liabilities
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 0	$ 0
Derivative liabilities	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	7	24
Derivative liabilities	64
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	$ 0
Derivative liabilities	$ 0