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Financial Derivative Instruments - Offsetting of Derivative Liabilities (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Other Noncurrent Liabilities |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Net amounts of liabilities presented in the Balance Sheet | $ 622 luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember |  |  |
Fuel derivatives | Prepaid expenses and other current assets |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amounts of recognized liabilities | 0 us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = luv_OtherAssetsCurrentMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | 182 us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = luv_OtherAssetsCurrentMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Gross amounts offset in the Balance Sheet | 0 luv_DerivativeLiabilityFairValueGrossAssetOffset / us-gaap_BalanceSheetLocationAxis = luv_OtherAssetsCurrentMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | (182)luv_DerivativeLiabilityFairValueGrossAssetOffset / us-gaap_BalanceSheetLocationAxis = luv_OtherAssetsCurrentMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Net amounts of liabilities presented in the Balance Sheet | 0 luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = luv_OtherAssetsCurrentMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | 0 luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = luv_OtherAssetsCurrentMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Fuel derivatives | Other Assets |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amounts of recognized liabilities | 0 us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | 100 us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Gross amounts offset in the Balance Sheet | 0 luv_DerivativeLiabilityFairValueGrossAssetOffset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | (100)luv_DerivativeLiabilityFairValueGrossAssetOffset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Net amounts of liabilities presented in the Balance Sheet | 0 luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | [1] | 0 luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | [1]
Fuel derivatives | Accrued Liabilities |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amounts of recognized liabilities | 1,432 us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = luv_AccruedLiabilitiesBalanceSheetLocationMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | 21 us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = luv_AccruedLiabilitiesBalanceSheetLocationMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Gross amounts offset in the Balance Sheet | (1,258)luv_DerivativeLiabilityFairValueGrossAssetOffset / us-gaap_BalanceSheetLocationAxis = luv_AccruedLiabilitiesBalanceSheetLocationMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | (9)luv_DerivativeLiabilityFairValueGrossAssetOffset / us-gaap_BalanceSheetLocationAxis = luv_AccruedLiabilitiesBalanceSheetLocationMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Net amounts of liabilities presented in the Balance Sheet | 174 luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = luv_AccruedLiabilitiesBalanceSheetLocationMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | [1] | 12 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 | 916 us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | 0 us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Gross amounts offset in the Balance Sheet | (355)luv_DerivativeLiabilityFairValueGrossAssetOffset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | 0 luv_DerivativeLiabilityFairValueGrossAssetOffset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Net amounts of liabilities presented in the Balance Sheet | 561 luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | [1] | 0 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 |  | 77 us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |
Gross amounts offset in the Balance Sheet | 0 luv_DerivativeLiabilityFairValueGrossAssetOffset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  | (32)luv_DerivativeLiabilityFairValueGrossAssetOffset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |
Net amounts of liabilities presented in the Balance Sheet | $ 61 luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | [1] | $ 45 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 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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Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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
Balance Type: | debit
Period Type: | instant

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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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Period Type: | instant

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Balance Type: | na
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