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Financial Derivative Instruments - Offsetting of Derivative Liabilities (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Other Noncurrent Liabilities |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Liability derivative contracts, net | $ 488 luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember |  | $ 622 luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember |
Fuel derivatives | Accrued Liabilities |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amounts of recognized liabilities | 1,413 us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = luv_AccruedLiabilitiesBalanceSheetLocationMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | 1,432 us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = luv_AccruedLiabilitiesBalanceSheetLocationMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Gross asset amounts offset in the Balance Sheet | (1,057)luv_DerivativeLiabilityFairValueGrossAssetOffset / us-gaap_BalanceSheetLocationAxis = luv_AccruedLiabilitiesBalanceSheetLocationMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | (1,258)luv_DerivativeLiabilityFairValueGrossAssetOffset / us-gaap_BalanceSheetLocationAxis = luv_AccruedLiabilitiesBalanceSheetLocationMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Liability derivative contracts, net | 356 luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = luv_AccruedLiabilitiesBalanceSheetLocationMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | [1] | 174 luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = luv_AccruedLiabilitiesBalanceSheetLocationMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | [1]
Fuel derivatives | Other Noncurrent Liabilities |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amounts of recognized liabilities | 893 us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | 916 us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Gross asset amounts offset in the Balance Sheet | (466)luv_DerivativeLiabilityFairValueGrossAssetOffset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | (355)luv_DerivativeLiabilityFairValueGrossAssetOffset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Liability derivative contracts, net | 427 luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | [1] | 561 luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | [1]
Interest rate derivatives | Other Noncurrent Liabilities |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amounts of recognized liabilities | 61 us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  | 61 us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |
Gross asset amounts offset in the Balance Sheet | 0 luv_DerivativeLiabilityFairValueGrossAssetOffset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  | 0 luv_DerivativeLiabilityFairValueGrossAssetOffset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |
Liability derivative contracts, net | $ 61 luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | [1] | $ 61 luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / 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 liability or 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 a right to receive collateral. + References No definition available. + Details
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Balance Type: | credit
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- Definition Fair value of asset associated with financial liability or 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
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Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
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- Definition Fair value of financial liability or 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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