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Financial Derivative Instruments - Premiums for Fuel Derivative Contracts (Details) - Fuel derivative contracts - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Designated as Hedging Instrument | Fuel and oil
Derivative [Line Items]
Premium expense recognized in income on derivatives	$ 26	$ 14
Not Designated as Hedging Instrument | Other (gains)/losses, net
Derivative [Line Items]
Premium expense recognized in income on derivatives	$ 0	$ 11

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- Definition

The premium (cost) of a hedge, expensed during the period.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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