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Financial Derivative Instruments and Risk Management (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
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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- Definition

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- Definition

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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