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Fair Value Measurements - Carrying Value and Fair Value of Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt with fixed interest rates (excluding commercial paper and finance leases)	$ 12,201	$ 12,174
Interest rate swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative, notional amount	500
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt with fixed interest rates (excluding commercial paper and finance leases)	$ 12,316	$ 12,213

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