XML 64 R51.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Fair Value Measurements - Quantitative Information about Level 3 Fair Value (Details) - Significant unobservable inputs (Level 3) - Measurement Input, Option Volatility | Sep. 30, 2022
--- | ---
Fourth quarter 2022 | Minimum |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Derivative asset, measurement input (in years) | 0.33
Fourth quarter 2022 | Maximum |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Derivative asset, measurement input (in years) | 0.59
Fourth quarter 2022 | Weighted Average |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Derivative asset, measurement input (in years) | 0.47
2023 | Minimum |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Derivative asset, measurement input (in years) | 0.42
2023 | Maximum |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Derivative asset, measurement input (in years) | 0.56
2023 | Weighted Average |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Derivative asset, measurement input (in years) | 0.50
2024 | Minimum |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Derivative asset, measurement input (in years) | 0.36
2024 | Maximum |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Derivative asset, measurement input (in years) | 0.48
2024 | Weighted Average |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Derivative asset, measurement input (in years) | 0.41

X
- Definition Value of input used to measure derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
Name: | us-gaap_DerivativeAssetMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputOptionVolatilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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