XML 54 R36.htm IDEA: XBRL DOCUMENT
v3.21.2

Financial Derivative Instruments - (Gain) Loss by Hedging Relationship (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Cash Flow Hedging |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
(Gain) loss recognized in AOCI on derivatives, net of tax | $ (186) | $ (9) | $ (279) | $ 107
Cash Flow Hedging | Fuel derivatives |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
(Gain) loss recognized in AOCI on derivatives, net of tax | (192) | (9) | (275) | 75
Cash Flow Hedging | Interest rate derivatives |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
(Gain) loss recognized in AOCI on derivatives, net of tax | 6 | 0 | (4) | 32
Not Designated as Hedging Instrument | Other Nonoperating Income (Expense) |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
(Gain) loss recognized in income on derivatives | (12) | 6 | (16) | 30
Not Designated as Hedging Instrument | Fuel derivatives | Other Nonoperating Income (Expense) |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
(Gain) loss recognized in income on derivatives | (12) | 1 | (16) | 1
Not Designated as Hedging Instrument | Interest rate derivatives | Other Nonoperating Income (Expense) |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
(Gain) loss recognized in income on derivatives | $ 0 | $ 5 | $ 0 | $ 29

X
- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
Name: | us-gaap_DerivativeGainLossOnDerivativeNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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
Name: | us-gaap_DerivativeInstrumentsGainLossLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CommodityContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_OtherNonoperatingIncomeExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |