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Financial Derivative Instruments and Risk Management (Details) - Aircraft Fuel Derivatives - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Percentage of actual consumption economically hedged	0.00%	25.00%	6.00%
Offsetting derivative instruments	$ 0	$ 0
Aircraft Fuel Expense
Derivative [Line Items]
Hedge effectiveness losses recognized in aircraft fuel expense	0	7,000,000	$ 5,000,000
Other Income
Derivative [Line Items]
Losses on derivatives resulting from the discontinuance of hedge accounting recognized in interest income and other	0	8,000,000	0
Comprehensive Income
Derivative [Line Items]
Hedge (gains) losses on derivatives recognized in comprehensive income	$ 0	$ 11,000,000	$ (1,000,000)

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- Definition

Percentage of actual consumption economically hedged.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

+ References

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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The amount of loss reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period.

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Amount, before tax and after reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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