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Financial Derivative Instruments - Premiums for Fuel Derivative Contracts (Details) - Fuel derivative contracts - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Designated as Hedging Instrument | Fuel and oil
Derivative [Line Items]
Premium expense (benefit) recognized in income on derivatives	$ 30	$ 26	$ 91	$ 79
Not Designated as Hedging Instrument | Other (gains)/losses, net
Derivative [Line Items]
Fuel derivative contracts not designated as hedges	$ 0	$ (14)	$ 0	$ (14)

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- Definition

Derivative, Premium (Benefit) Expense

+ References

No definition available.

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- Definition

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

+ References

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480237/815-40-50-5

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