XML 91 R75.htm IDEA: XBRL DOCUMENT
v3.22.4

Financial Derivative Instruments - Location and Amount Recognized in Income by Hedging Relationship (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021
Cash Flow Hedging |  |  |  |
Derivative [Line Items] |  |  |  |
Amount of (gain) loss reclassified from AOCI into income | $ (508) | $ (463) |  |
Cash Flow Hedging | Fuel derivative contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Amount of (gain) loss reclassified from AOCI into income | (494) | (461) |  |
Cash Flow Hedging | Interest rate derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Amount of (gain) loss reclassified from AOCI into income | $ (14) | $ (2) |  |
Fuel and oil |  |  |  |
Derivative [Line Items] |  |  |  |
Derivatives designated as hedging instruments |  |  | $ (832) | $ 4
Fuel and oil | Cash Flow Hedging | Fuel derivative contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Amount of (gain) loss reclassified from AOCI into income |  |  | (832) | 4
Fuel and oil | Cash Flow Hedging | Interest rate derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Amount of (gain) loss reclassified from AOCI into income |  |  | 0 | 0
Other operating expenses |  |  |  |
Derivative [Line Items] |  |  |  |
Derivatives designated as hedging instruments |  |  | 7 |
Other operating expenses | Cash Flow Hedging | Fuel derivative contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Amount of (gain) loss reclassified from AOCI into income |  |  | 0 |
Other operating expenses | Cash Flow Hedging | Interest rate derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Amount of (gain) loss reclassified from AOCI into income |  |  | $ 7 |
Other (gains)/losses, net |  |  |  |
Derivative [Line Items] |  |  |  |
Derivatives designated as hedging instruments |  |  |  | 6
Other (gains)/losses, net | Cash Flow Hedging | Fuel derivative contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Amount of (gain) loss reclassified from AOCI into income |  |  |  | 6
Other (gains)/losses, net | Cash Flow Hedging | Interest rate derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Amount of (gain) loss reclassified from AOCI into income |  |  |  | 0
Other operating expenses |  |  |  |
Derivative [Line Items] |  |  |  |
Derivatives designated as hedging instruments |  |  |  | 6
Other operating expenses | Cash Flow Hedging | Fuel derivative contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Amount of (gain) loss reclassified from AOCI into income |  |  |  | 0
Other operating expenses | Cash Flow Hedging | Interest rate derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Amount of (gain) loss reclassified from AOCI into income |  |  |  | $ 6

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_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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 https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
Name: | us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 https://asc.fasb.org/extlink&oid=126968391&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 https://asc.fasb.org/extlink&oid=126968391&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 https://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_IncomeStatementLocationAxis=luv_FuelAndOilMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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