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Financial Derivative Instruments - Offsetting of Derivative Assets (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Offsetting Assets [Line Items]
Gross amounts of recognized assets	$ 682	$ 134
Fuel derivative contracts | Prepaid expenses and other current assets
Offsetting Assets [Line Items]
Gross amounts of recognized assets	338	13
Gross amounts offset in the Balance Sheet	69	3
Net amounts of assets presented in the Balance Sheet	269	10
Fuel derivative contracts | Other assets
Offsetting Assets [Line Items]
Gross amounts of recognized assets	343	121
Gross amounts offset in the Balance Sheet	93	31
Net amounts of assets presented in the Balance Sheet	250	90
Interest rate derivatives | Other assets
Offsetting Assets [Line Items]
Gross amounts of recognized assets	1	0
Gross amounts offset in the Balance Sheet	0	0
Net amounts of assets presented in the Balance Sheet	$ 1	$ 0

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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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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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Fair value, before 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 elected not to be offset. Excludes assets not subject to a master netting arrangement.

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