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Commitments and Contingencies - Aircraft Purchase Commitments by AC Type (Details) | Mar. 31, 2018 aircraft
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B-737-8 MAX |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Aircraft Purchase Commitments, Minimum Quantity Required | 236
Aircraft Purchase Commitments - Options | 115
B-737-7 MAX |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Aircraft Purchase Commitments, Minimum Quantity Required | 30
B-737-800 |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Aircraft Purchase Commitments, Minimum Quantity Required | 17

X
- Definition The amount the company has an option to purchase within the contractual purchase commitment. + References No definition available. + Details
Name: | luv_LongTermPurchaseCommitmentsOptions737Mx
Namespace Prefix: | luv_
Data Type: | xbrli:integerItemType
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_UnrecordedUnconditionalPurchaseObligationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum number of units that must be purchased, in connection with an unconditional purchase obligation that has not been recognized for financial reporting purposes. + References No definition available. + Details
Name: | us-gaap_UnrecordedUnconditionalPurchaseObligationMinimumQuantityRequired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_AircraftTypeAxis=luv_B7378MAXMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AircraftTypeAxis=us-gaap_B737MaxMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AircraftTypeAxis=us-gaap_B737800Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |