Derivative Instruments - Schedule of Cash Flow Hedges Reclassified from AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024
Derivative [Line Items]
Gain / (Loss) Reclassified from AOCI into Income (Effective Portion)	$ 3	$ (1)	$ (4)
Commodity contracts
Derivative [Line Items]
Gain / (Loss) Reclassified from AOCI into Income (Effective Portion)	(6)	(1)	2
Commodity contracts \| Location of Gain / (Loss) Reclassified from AOCI into Income: us-gaap:CostOfGoodsAndServicesSold
Derivative [Line Items]
Gain / (Loss) Reclassified from AOCI into Income (Effective Portion)	6	1	(2)
Forward exchange contracts
Derivative [Line Items]
Gain / (Loss) Reclassified from AOCI into Income (Effective Portion)	0	(1)	(1)
Forward exchange contracts \| Location of Gain / (Loss) Reclassified from AOCI into Income: us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
Derivative [Line Items]
Gain / (Loss) Reclassified from AOCI into Income (Effective Portion)	0	1	1
Treasury locks
Derivative [Line Items]
Gain / (Loss) Reclassified from AOCI into Income (Effective Portion)	3	3	3
Treasury locks \| Location of Gain / (Loss) Reclassified from AOCI into Income: us-gaap:InterestExpense
Derivative [Line Items]
Gain / (Loss) Reclassified from AOCI into Income (Effective Portion)	$ (3)	$ (3)	$ (3)