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Financial Derivative Instruments - Offsetting Derivative Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	$ 14	$ 0
Fuel derivative contracts \| Prepaid expenses and other current assets
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	27	15
Gross amounts offset in the Balance Sheet	(27)	(15)
Net amounts of liabilities presented in the Balance Sheet	0	0
Fuel derivative contracts \| Other assets
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	17	35
Gross amounts offset in the Balance Sheet	(17)	(35)
Net amounts of liabilities presented in the Balance Sheet	$ 0	$ 0

Fair value of asset associated with financial liability or 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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