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Financial Derivative Instruments - Offsetting of Derivative Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fuel derivative contracts | Prepaid expenses and other current assets
Offsetting Assets
Gross amounts of recognized assets	$ 352	$ 409
Gross amounts of recognized liabilities	(106)	(80)
Net amounts of assets presented in the Balance Sheet	$ 246	$ 329
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Prepaid expenses and other current assets	Prepaid expenses and other current assets
Fuel derivative contracts | Other assets
Offsetting Assets
Gross amounts of recognized assets	$ 160	$ 287
Gross amounts of recognized liabilities	0	(95)
Net amounts of assets presented in the Balance Sheet	$ 160	$ 192
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Interest rate derivatives
Offsetting Assets
Net amounts of assets presented in the Balance Sheet	$ 14	$ 0
Interest rate derivatives | Other assets
Offsetting Assets
Gross amounts of recognized assets	14	0
Gross amounts of recognized liabilities	$ 0	$ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets

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- Definition

Fair value of liability associated with 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.

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- Definition

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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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No definition available.

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