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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Fort Lauderdale-Hollywood International Airport | Sep. 30, 2014 HOU | Sep. 30, 2014 Los Angeles World Airport | Jun. 30, 2012 DAL | Dec. 31, 2010 DAL | Sep. 30, 2014 DAL
Airport Project [Line Items] |  |  |  |  |  |  |  |
Total Expected Cost Of Airport Project |  |  | $ 295 | $ 156 | $ 525 |  |  | $ 519
Assets constructed for others | 570 | 453 |  | 42 | 44 |  |  | 484
Municipal bonds issued |  |  |  |  |  | 146 | 310 |
Construction obligation | $ 521 | $ 437 |  |  |  |  |  | $ 481

X
- Details
Name: | luv_AirportProjectLineItems
Namespace Prefix: | luv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The aggregate costs related to airport construction projects recorded as an asset. + References No definition available. + Details
Name: | luv_AssetsConstructedForOthers
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Construction Obligation, Noncurrent + References No definition available. + Details
Name: | luv_ConstructionObligationNoncurrent
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Long-term debt securities issued by state, city or local governments or the agencies operated by state, city or local governments. + References No definition available. + Details
Name: | luv_MunicipalBondsIssued
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The total expected cost of the airport modernization project for the city. + References No definition available. + Details
Name: | luv_TotalExpectedCostOfAirportProject
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant