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Fair Value Measurements - Carrying Value and Fair Value of Long-Term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023
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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) | $ 4,098 | $ 4,123
Interest rate swaps |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative, notional amount | 1,200 | 1,200
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) | $ 3,780 | $ 3,844

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