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Financial Derivative Instruments and Risk Management (Details) bbl in Thousands, $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 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 | $ 3 | $ (2)
Fuel Derivatives [Member] |  |
Derivative [Line Items] |  |
Longest remaining term, cash flow hedge (months) | 6 months | 6 months
Barrels Of Fuel Covered Under Derivative Contracts | bbl | 1,220 | 2,112
Derivative, Collateral, Right to Reclaim Cash | $ 0 | $ 0
Fuel [Member] | Call Option [Member] |  |
Derivative [Line Items] |  |
Percentage Fuel Hedged - Third Quarter Current Year | 19.00% |
Percentage Fuel Hedged - Fourth Quarter Second Year | 20.00% |
Fair Value, Recurring [Member] |  |
Derivative [Line Items] |  |
Derivative Asset | $ 0 | 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 | $ 0 | $ 8

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- Definition 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 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details
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