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Financial Derivative Instruments - Offsetting Derivative Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	$ 2	$ 6
Fuel derivative contracts | Prepaid expenses and other current assets
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	69	3
Gross amounts offset in the Balance Sheet	69	3
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	93	31
Gross amounts offset in the Balance Sheet	93	31
Net amounts of liabilities presented in the Balance Sheet	0	0
Interest rate derivatives | Other noncurrent liabilities
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	2	6
Gross amounts offset in the Balance Sheet	0	0
Net amounts of liabilities presented in the Balance Sheet	$ 2	$ 6

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- Definition

Fair value, before effects of master netting arrangements, of a 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. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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