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Financial Derivative Instruments - Offsetting of Derivative Assets (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Offsetting Assets [Line Items] |  |  |  |
Asset derivative contracts, net | $ 4 luv_DerivativeAssetFairValueAmountOffsetAgainstCollateralTotal |  | $ 13 luv_DerivativeAssetFairValueAmountOffsetAgainstCollateralTotal |
Fuel derivatives | Accrued Liabilities |  |  |  |
Offsetting Assets [Line Items] |  |  |  |
Gross amounts of recognized assets | 1,057 us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = luv_AccruedLiabilitiesBalanceSheetLocationMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | 1,258 us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = luv_AccruedLiabilitiesBalanceSheetLocationMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Gross liability amounts offset in the Balance Sheet | (1,057)luv_DerivativeAssetFairValueGrossLiabilityOffset / us-gaap_BalanceSheetLocationAxis = luv_AccruedLiabilitiesBalanceSheetLocationMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | (1,258)luv_DerivativeAssetFairValueGrossLiabilityOffset / us-gaap_BalanceSheetLocationAxis = luv_AccruedLiabilitiesBalanceSheetLocationMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Asset derivative contracts, net | 0 luv_DerivativeAssetFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = luv_AccruedLiabilitiesBalanceSheetLocationMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | [1] | 0 luv_DerivativeAssetFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = luv_AccruedLiabilitiesBalanceSheetLocationMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | [1]
Fuel derivatives | Other Noncurrent Liabilities |  |  |  |
Offsetting Assets [Line Items] |  |  |  |
Gross amounts of recognized assets | 466 us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | 355 us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Gross liability amounts offset in the Balance Sheet | (466)luv_DerivativeAssetFairValueGrossLiabilityOffset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | (355)luv_DerivativeAssetFairValueGrossLiabilityOffset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Asset derivative contracts, net | 0 luv_DerivativeAssetFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | [1] | 0 luv_DerivativeAssetFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | [1]
Interest rate derivatives | Other Assets |  |  |  |
Offsetting Assets [Line Items] |  |  |  |
Gross amounts of recognized assets | 4 us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  | 13 us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |
Gross liability amounts offset in the Balance Sheet | 0 luv_DerivativeAssetFairValueGrossLiabilityOffset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  | 0 luv_DerivativeAssetFairValueGrossLiabilityOffset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |
Asset derivative contracts, net | $ 4 luv_DerivativeAssetFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | [1] | $ 13 luv_DerivativeAssetFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | [1]
[1] | The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the unaudited Condensed Consolidated Balance Sheet in Note 5.

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- Definition Net fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected to be offset against an obligation to return collateral. + References No definition available. + Details
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Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected to be offset against collateral. + References No definition available. + Details
Name: | luv_DerivativeAssetFairValueGrossLiabilityOffset
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226052-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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