Financial Instruments and Fair Value Measurements - Summary of Hedges Classified as Current or Non-current in Balance Sheets Based on Maturity Dates (Details) - USD ($) $ in Millions	Dec. 31, 2023	Jun. 30, 2023
Interest rate derivatives - cash flow hedges | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, reported under other current assets	$ 13	$ 21
Derivatives, reported under other non-current assets	12	20
Derivatives, reported under other-non current liability	(5)	0
Foreign currency derivatives - cash flow hedges | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, reported under other current assets	0	2
Derivatives, reported under other current liability	(1)	0
Cross currency interest rate derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, reported under other current assets	0	1
Derivatives, reported under other non-current assets	0	36
Derivatives, reported under other current liability	0	(2)
Derivatives, reported under other-non current liability	(3)	0
Cross currency interest rate derivatives | Fair Value Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, reported under other non-current assets	0	9
Derivatives, reported under other current liability	$ 0	$ (1)