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Financial Derivative Instruments and Risk Management - Fuel Derivatives (Details) - Aircraft Fuel Derivatives - Fuel $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2023 USD ($) MBoe	Dec. 31, 2022 USD ($) MBoe
Derivative [Line Items]
Asset fair value recorded in prepaid expense and other current assets	$ 8	$ 3
Longest remaining term (months)	3 months	3 months
Hedged volume (barrels, in thousands) | MBoe	4,380,000	450
Estimated amount of existing losses expected to be reclassified into earnings in the next 12 months	$ 4	$ 2

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- Definition

Barrels of fuel covered under derivative contracts as of the end of the period.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Maximum period the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated net amount of unrealized gains or losses on price risk cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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