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Financial Derivative Instruments - Premiums for Fuel Derivative Contracts (Details) - Fuel derivatives - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Designated as Hedging Instrument | Operating Expense [Member]
Derivative [Line Items]
Premiums paid for fuel derivative contracts	$ 14	$ 24
Not Designated as Hedging Instrument | Other (gains)/losses, net
Derivative [Line Items]
Premiums paid for fuel derivative contracts	$ 11	$ 0

X

- 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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X

- Details

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- Details

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- Details

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- Details

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