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Financial Derivative Instruments - Location and Amount Recognized in Income by Hedging Relationship (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Fuel |  |  |  |
Derivative [Line Items] |  |  |  |
(Gain) Loss on Derivative Instruments, Net, Pretax | $ 18 | $ 19 | $ 54 | $ 28
Other (gains)/losses, net |  |  |  |
Derivative [Line Items] |  |  |  |
(Gain) Loss on Derivative Instruments, Net, Pretax | 22 |  | 38 |
Interest Expense |  |  |  |
Derivative [Line Items] |  |  |  |
(Gain) Loss on Derivative Instruments, Net, Pretax | 2 | 8 | 6 | 21
Cash Flow Hedging | Fuel | Fuel derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net | 18 | 19 | 54 | 28
Cash Flow Hedging | Fuel | Interest rate derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net | 0 | 0 | 0 | 0
Cash Flow Hedging | Other (gains)/losses, net | Fuel derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring | 22 |  | 38 |
Cash Flow Hedging | Other (gains)/losses, net | Interest rate derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net | 0 |  | 0 |
Cash Flow Hedging | Interest Expense | Fuel derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net | 0 | 0 | 0 | 0
Cash Flow Hedging | Interest Expense | Interest rate derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net | 0 | 2 | 1 | 3
Designated as Hedging Instrument | Fair Value Hedging | Fuel | Interest rate derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
(Gain) Loss on Derivative Instruments, Net, Pretax | 0 | 0 | 0 | 0
Designated as Hedging Instrument | Fair Value Hedging | Other (gains)/losses, net | Interest rate derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
(Gain) Loss on Derivative Instruments, Net, Pretax | 0 |  | 0 |
Designated as Hedging Instrument | Fair Value Hedging | Interest Expense | Interest rate derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
(Gain) Loss on Derivative Instruments, Net, Pretax | (2) | 0 | (6) | 1
Not Designated as Hedging Instrument | Fuel derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring | 22 |  | 38 |
Not Designated as Hedging Instrument | Fair Value Hedging | Fuel | Interest rate derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Interest Expense, Debt | 0 | 0 | 0 | 0
Not Designated as Hedging Instrument | Fair Value Hedging | Other (gains)/losses, net | Interest rate derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Interest Expense, Debt | 0 |  | 0 |
Not Designated as Hedging Instrument | Fair Value Hedging | Interest Expense | Interest rate derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Interest Expense, Debt | $ 4 | $ 6 | $ 11 | $ 17

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624177-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + 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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