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v3.19.3.a.u2

Financial Derivative Instruments and Risk Management (Details) bbl in Thousands, $ in Millions | 12 Months Ended
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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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