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Fair Value Measurements - Contractual Amounts of the Outstanding Instruments (Details) - Designated as hedging instruments - USD ($) $ in Millions | Dec. 31, 2024 | Jun. 30, 2024
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Cash flow hedges | Forward starting swaps |  |
Derivative [Line Items] |  |
Fair value of derivative instruments | $ 300 | $ 300
Net investment hedge | Cross-currency swap |  |
Derivative [Line Items] |  |
Fair value of derivative instruments | $ 140 | $ 150

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