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Financial Derivative Instruments - Narrative (Details) - Fuel derivative contracts $ in Millions	3 Months Ended
	Jun. 30, 2025 USD ($)
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	$ 209

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Amount, before tax and after reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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The cash inflow provided by derivative instruments during the period, which are classified as financing activities, excluding those designated as hedging instruments.

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