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v3.20.1

Financial Derivative Instruments and Risk Management (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Fuel [Member] | Call Option [Member] |  |
Derivative [Line Items] |  |
Percentage Fuel Hedged - Fourth Quarter Current Year | 29.00% |
Percentage Fuel Hedged - First Quarter Second Year | 25.00% |
Percentage Fuel Hedged - Second Quarter Second Year | 25.00% |
Fair Value, Recurring [Member] |  |
Derivative [Line Items] |  |
Derivative Asset | $ 1 | $ 8
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Derivative [Line Items] |  |
Derivative Asset | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Derivative [Line Items] |  |
Derivative Asset | $ 1 | $ 8

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