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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
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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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