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Financial Derivative Instruments and Risk Management (Details 2) - Fuel derivatives [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Longest remaining term (months)	6 months	6 months
Derivative, Collateral, Right to Reclaim Cash	$ 0	$ 0
Aircraft fuel expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedge effectiveness (gains) losses recognized in aircraft fuel expense	(5)	(2)	$ 15
Comprehensive Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedge (gains) losses on derivatives recognized in comprehensive income	$ 1	$ (6)	$ (6)

X

- Definition

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

+ References

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- Definition

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

+ References

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+ References

No definition available.

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- Definition

Maximum period the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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