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Financial Derivative Instruments - Fuel Hedging (Details) | Mar. 31, 2015 gal
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Remainder of 2015 |  |
Volume of Fuel Hedging [Line Items] |  |
Fuel Hedged (in gallons) | 0 invest_DerivativeNonmonetaryNotionalAmount / luv_VolumeOfFuelHedgingAxis = luv_CurrentYearMember | [1]
2016 |  |
Volume of Fuel Hedging [Line Items] |  |
Fuel Hedged (in gallons) | 621,000,000 invest_DerivativeNonmonetaryNotionalAmount / luv_VolumeOfFuelHedgingAxis = luv_NextYearMember | [2]
2017 |  |
Volume of Fuel Hedging [Line Items] |  |
Fuel Hedged (in gallons) | 661,000,000 invest_DerivativeNonmonetaryNotionalAmount / luv_VolumeOfFuelHedgingAxis = luv_ThirdYearMember | [2]
2018 |  |
Volume of Fuel Hedging [Line Items] |  |
Fuel Hedged (in gallons) | 0 invest_DerivativeNonmonetaryNotionalAmount / luv_VolumeOfFuelHedgingAxis = luv_FourthYearMember | [1]
[1] | While the Company still holds derivative contracts as of March 31, 2015, that will settle during the remainder of 2015 and 2018, the majority of the losses associated with those contracts are substantially locked in. However, if market prices were to increase or decrease significantly related to the 2015 positions prior to these contracts settling, the losses incurred at settlement could be slightly lower or higher than currently expected amounts during that period.
[2] | Due to the types of derivatives utilized by the Company and different price levels of those contracts, these volumes represent the maximum economic hedge in place and may vary significantly as market prices fluctuate.

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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