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Summary of Significant Accounting Policies - Supplies, net (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Accounting Policies [Abstract]
Allowance for obsolescence	$ (17)	$ (12)

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

The amount of the valuation account as of the balance sheet date which reduces the carrying amount of airline related inventory (including expendable merchandise, goods, commodities, or supplies to be used primarily in air transport of passengers or freight) to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage.

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No definition available.

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Name:	us-gaap_AirlineRelatedInventoryValuationReserves
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant