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Financial Derivative Instruments and Risk Management (Details) bbl in Thousands, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) bbl | Dec. 31, 2019 USD ($) bbl
Derivative [Line Items] |  |
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months |  | $ (2)
Fuel Derivatives [Member] |  |
Derivative [Line Items] |  |
Longest remaining term, cash flow hedge (months) | 3 months | 6 months
Barrels Of Fuel Covered Under Derivative Contracts | bbl | 680 | 2,112
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months | $ 2 |
Derivative, Collateral, Right to Reclaim Cash | $ 0 | $ 0
Fuel [Member] | Call Option [Member] |  |
Derivative [Line Items] |  |
Percentage Fuel Hedged - Fourth Quarter Second Year | 25.00% |
Fair Value, Recurring [Member] |  |
Derivative [Line Items] |  |
Derivative Asset |  | 8
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Derivative [Line Items] |  |
Derivative Asset |  | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Derivative [Line Items] |  |
Derivative Asset |  | 8
Prepaid Expenses and Other Current Assets [Member] | Fuel Derivatives [Member] |  |
Derivative [Line Items] |  |
Derivative Asset, Current | $ 0 | $ 8

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