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Financial Derivative Instruments and Risk Management (Details) bbl in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) bbl	Dec. 31, 2018 USD ($) bbl	Dec. 31, 2017 USD ($)
Derivative [Line Items]
Percentage Fuel Hedged - First Quarter Second Year	20.00%
Percentage fuel covered under derivative contracts
Percentage Fuel Hedged - Second Quarter Second Year	19.00%
Percentage Fuel Hedged - Third Quarter Second Year	0.00%
Percentage Fuel Hedged - Fourth Quarter Second Year	0.00%
Fuel derivatives [Member]
Percentage fuel covered under derivative contracts
Longest remaining term (months)	6 months	6 months
Derivative, Nonmonetary Notional Amount | bbl	2,112	756
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months	$ 2	$ 4
Percentage of actual consumption hedged	6.00%	4.00%	10.00%
Derivative, Collateral, Right to Reclaim Cash	$ 0	$ 0
Fuel [Member] | Jet Fuel Call Option Spread Agreements [Member]
Derivative [Line Items]
Percentage Fuel Hedged - First Quarter Second Year	20.00%
Percentage fuel covered under derivative contracts
Percentage Fuel Hedged - Second Quarter Second Year	19.00%
Percentage Fuel Hedged - Third Quarter Second Year	0.00%
Percentage Fuel Hedged - Fourth Quarter Second Year	0.00%
Aircraft Fuel Expense [Member] | Fuel derivatives [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 5	2	$ (15)
Comprehensive Income [Member] | Fuel derivatives [Member]
Percentage fuel covered under derivative contracts
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(1)	6	$ 6
Prepaid Expenses and Other Current Assets [Member] | Fuel derivatives [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 8	$ 0

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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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