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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Designated as Hedging Instrument | Fuel and oil
Derivative [Line Items]
Premium expense recognized in income on derivatives	$ 14	$ 13	$ 43	$ 51
Not Designated as Hedging Instrument | Other (gains)/losses, net
Derivative [Line Items]
Premium expense recognized in income on derivatives	$ 11	$ 11	$ 32	$ 22

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- Definition

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

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- Definition

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