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Fair Value Measurements - Quantative Information about Level 3 Fair Value (Details) | 3 Months Ended
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Sep. 30, 2014
Discounted Cash Flow | Illiquidity Premium | Auction rate securities |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 3.00%
Discounted Cash Flow | Counterparty Credit Spread | Auction rate securities |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 1.00%
Fair Value Measurement Range, Maximum | 2.00%
Discounted Cash Flow | Time To Principal Recovery | Auction rate securities |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range Min, Term | 8 years
Fourth Quarter of 2014 | Option Model | Implied Volatility | Fuel derivatives |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 11.00%
Fair Value Measurement Range, Maximum | 23.00%
2015 | Option Model | Implied Volatility | Fuel derivatives |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 14.00%
Fair Value Measurement Range, Maximum | 24.00%
2016 | Option Model | Implied Volatility | Fuel derivatives |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 13.00%
Fair Value Measurement Range, Maximum | 21.00%
2017 | Option Model | Implied Volatility | Fuel derivatives |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 11.00%
Fair Value Measurement Range, Maximum | 16.00%
2018 | Option Model | Implied Volatility | Fuel derivatives |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 9.00%
Fair Value Measurement Range, Maximum | 15.00%

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- Definition Maximum range used in level 3 fair value calculation + References No definition available. + Details
Name: | luv_FairValueMeasurementRangeMax
Namespace Prefix: | luv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Minimum range used in level 3 fair value calculation + References No definition available. + Details
Name: | luv_FairValueMeasurementRangeMin
Namespace Prefix: | luv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Fair Value Measurement Range Min, Term + References No definition available. + Details
Name: | luv_FairValueMeasurementRangeMinTerm
Namespace Prefix: | luv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | luv_QuantitativeInformationAboutLevel3LineItems
Namespace Prefix: | luv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration