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Financial Derivative Instruments and Risk Management (Details) - Aircraft Fuel Derivatives | 12 Months Ended
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Dec. 31, 2020 USD ($) aircraft | Dec. 31, 2019 USD ($) aircraft | Dec. 31, 2018 USD ($)
Derivative [Line Items] |  |  |
Longest remaining term (months) | 0 years | 6 months |
Hedged volume (barrels, in thousands) | aircraft | 0 | 2,112,000 |
Estimated amount of existing (gains) losses expected to be reclassified into earnings in the next 12 months | $ 0 | $ (2,000,000) |
Percentage of actual consumption economically hedged | 25.00% | 6.00% | 4.00%
Offsetting derivative instruments | $ 0 | $ 0 |
Aircraft Fuel Expense |  |  |
Derivative [Line Items] |  |  |
Hedge effectiveness (gains) losses recognized in aircraft fuel expense | 7,000,000 | 5,000,000 | $ 2,000,000
Other Income |  |  |
Derivative [Line Items] |  |  |
Losses on derivatives resulting from the discontinuance of hedge accounting recognized in interest income and other | 8,000,000 | 0 | 0
Comprehensive Income |  |  |
Derivative [Line Items] |  |  |
Hedge (gains) losses on derivatives recognized in comprehensive income | 11,000,000 | (1,000,000) | $ 6,000,000
Prepaid Expenses and Other Current Assets |  |  |
Derivative [Line Items] |  |  |
Asset fair value recorded in prepaid expenses and other | $ 0 | $ 8,000,000 |

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- Definition Percentage of actual consumption economically hedged. + References No definition available. + Details
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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, expected to be settled within one year or normal operating cycle, if longer. 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 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition The amount of loss reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period. + 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 (e) -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + 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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- Definition Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558989&loc=d3e80720-113993 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 + Details
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