Derivative Instruments - Schedule of Derivatives Not Designated as Hedging Instruments Recognized in Income (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024
Derivative [Line Items]
Gain / (Loss) Recognized in Income for Derivatives not Designated as Hedging Instruments	$ 23	$ (24)	$ (1)
Forward exchange contracts \| Location of Gain / (Loss) Recognized in the Consolidated Income Statements: us-gaap:OtherOperatingIncomeExpenseNet
Derivative [Line Items]
Gain / (Loss) Recognized in Income for Derivatives not Designated as Hedging Instruments	0	(2)	15
Interest rate swaps \| Location of Gain / (Loss) Recognized in the Consolidated Income Statements: us-gaap:OtherOperatingIncomeExpenseNet
Derivative [Line Items]
Gain / (Loss) Recognized in Income for Derivatives not Designated as Hedging Instruments	0	0	(16)
Cross currency swaps \| Location of Gain / (Loss) Recognized in the Consolidated Income Statements: us-gaap:OtherOperatingIncomeExpenseNet
Derivative [Line Items]
Gain / (Loss) Recognized in Income for Derivatives not Designated as Hedging Instruments	$ 23	$ (22)	$ 0