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Sublease Table (Details) - B-717-200 Aircraft - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013
B717 Sublease Liability [Line Items] |  |  |  |
Sublease Obligations |  | $ 30 | $ 63 | $ 122
Interest Expense, Accretion |  | 1 | 5 |
Additional Estimated Loss on Sublease |  | 5 | 22 |
Sublease Transaction Costs | [1] | $ (39) | $ (86) |
[1] | Includes lease conversion cost payments

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- Definition Additional estimated cost, at the scheduled date of delivery of each B717 to Delta (including the conversion, maintenance, and other contractual costs to be incurred), of the lease of the B717s, net of the future sublease income from Delta. + References No definition available. + Details
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Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition [Line Items] for B717 Sublease Liability [Table] + References No definition available. + Details
Name: | luv_B717SubleaseLiabilityLineItems
Namespace Prefix: | luv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest Expense, Accretion + References No definition available. + Details
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Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The remaining estimated cost (including the conversion, maintenance, and other contractual costs to be incurred) of the lease of the B717s currently accounted for as operating leases, net of the future sublease income from Delta. + References No definition available. + Details
Name: | luv_SubleaseObligations
Namespace Prefix: | luv_
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- Definition Sublease Transaction Costs + References No definition available. + Details
Name: | luv_SubleaseTransactionCosts
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |