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Financial Derivative Instruments - Narrative (Details) - Fuel derivative contracts - USD ($) $ in Millions |  | 3 Months Ended
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Sep. 30, 2025 | Sep. 30, 2025 | Jun. 30, 2025
Derivative [Line Items] |  |  |
Proceeds from derivative instrument |  |  | $ 40
Amount of loss reclassified from AOCI into income |  | $ 36 |
Amount of loss remaining in AOCI related to closed fuel hedging contracts | $ 173 |  |

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