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This element represents the portion of the balance sheet assertion valued at fair value and used in connection with the fair value disclosures. Securities that are debt instruments (corporate or municipal bonds) that typically have long-term nominal maturities for which the interest rate is reset through an auction process. It could also refer to a preferred stock for which the dividend is reset through the same type of auction process. Classified as available for sale securities.

No definition available.

Name:	luv_AuctionRateSecuritiesClassifiedAsAvailableForSaleSecuritiesFairValueDisclosure
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Securities that are debt instruments (corporate or municipal bonds) that typically have long-term nominal maturities for which the interest rate is reset through an auction process. This value is as of the first failed auctions beginning as of 1Q08.

No definition available.

Name:	luv_AuctionRateSecuritiesFailedAuction
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The high end of the range of time remaining until maturity for auction rate securities outstanding.

No definition available.

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The low end of the range of time remaining until maturity for auction rate securities held.

No definition available.

Name:	luv_AuctionRateSecuritiesLowerRemainingMaturityRange
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Auction Rate securities sold at par after failed auctions during 1Q08.

No definition available.

Name:	luv_AuctionRateSecuritiesSoldAtParAfterFailedAuctions
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Period Type:	instant

No definition available.

Name:	luv_CashEquivalentsCommericalPaperFairValueDisclosure
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

A borrowing which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. Such obligations are due 2016.

No definition available.

Name:	luv_ConvertibleDebtDue2016
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

Name:	luv_DebenturesDue2027FairValueDisclosure
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Fair value as of the balance sheet date of deferred compensation.

No definition available.

Name:	luv_DeferredCompensationLiabilitiesAtFairValue
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The asset fair value of financial contracts between two parties, the buyer and the seller of the option, where the buyer has the right but not the obligation to buy/sell an agreed quantity of a particular commodity or financial instrument from the seller of the option at a certain time for a certain price. The seller is obligated to buy/sell the asset a the strike price if the buyer exercises the option. Recorded as a net asset in the Consolidated Balance Sheet.

No definition available.

Name:	luv_FairValueAssetsMeasuredOnRecurringBasisFuelDerivativesOptionContractsRecordedAsNetAsset
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Data Type:	xbrli:monetaryItemType
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No definition available.

Name:	luv_FairValueAssetsMeasuredOnRecurringBasisFuelDerivativesOptionContractsRecordedAsNetLiability
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Period Type:	instant

No authoritative reference available.

No definition available.

Name:	luv_FairValueAssetsMeasuredOnRecurringBasisFuelDerivativesSwapContractsRecordedAsNetAsset
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The asset fair value of forward-based contracts in which two parties agree to swap streams of payments over a specified period. The payment streams are based on an agreed-upon (or notional) principal amount. Recorded as a net liability in the Consolidated Balance Sheet.

No definition available.

Name:	luv_FairValueAssetsMeasuredOnRecurringBasisFuelDerivativesSwapContractsRecordedAsNetLiability
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Total of items classified as assets as of the balance sheet date that are measured at fair value on a recurring basis.

No definition available.

Name:	luv_FairValueAssetsMeasuredOnRecurringBasisTotalAssets
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Data Type:	xbrli:monetaryItemType
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The liability fair value of financial contracts between two parties, the buyer and the seller of the option, where the buyer has the right but not the obligation to buy/sell an agreed quantity of a particular commodity or financial instrument from the seller of the option at a certain time for a certain price. The seller is obligated to buy/sell the asset a the strike price if the buyer exercises the option. Recorded as a net asset in the Consolidated Balance Sheet.

No definition available.

Name:	luv_FairValueLiabilitiesMeasuredOnRecurringBasisFuelDerivativesOptionContractsRecordedAsNetAsset
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

No definition available.

Name:	luv_FairValueLiabilitiesMeasuredOnRecurringBasisFuelDerivativesOptionContractsRecordedAsNetLiability
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
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The liability fair value of forward-based contracts in which two parties agree to swap streams of payments over a specified period. The payment streams are based on an agreed-upon (or notional) principal amount. Recorded as a net asset in the Consolidated Balance Sheet.

No definition available.

Name:	luv_FairValueLiabilitiesMeasuredOnRecurringBasisFuelDerivativesSwapContractsRecordedAsNetAsset
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

Name:	luv_FairValueLiabilitiesMeasuredOnRecurringBasisFuelDerivativesSwapContractsRecordedAsNetLiability
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
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Total of items classified as liabilities as of the balance sheet date that are measured at fair value on a recurring basis.

No definition available.

Name:	luv_FairValueLiabilitiesMeasuredOnRecurringBasisTotalLiabilities
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

This element is used in connection with the fair value disclosures. It represents certificates of deposit ("CDs") classified as cash equivalents, which are FDIC insured investments available at banks and savings and loan institutions with maturities less than one year. Customers agree to lend money to the institutions for a certain amount of time. In exchange for doing so, the customer is paid a predetermined rate of interest. Often, banks will charge a penalty fee if the money is withdrawn from the CD before it matures.

No definition available.

Name:	luv_FairValueMeasuredOnRecurringBasisCashEquivalentCertificatesOfDeposit
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

This element is used in connection with the fair value disclosures. It represents long-term certificates of deposit ("CDs"), which are FDIC insured investments available at banks and savings and loan institutions with maturities one year and greater. Customers agree to lend money to the institutions for a certain amount of time. In exchange for doing so, the customer is paid a predetermined rate of interest. Often, banks will charge a penalty fee if the money is withdrawn from the CD before it matures.

No definition available.

Name:	luv_FairValueMeasuredOnRecurringBasisLongTermCertificatesOfDeposit
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

No definition available.

Name:	luv_FairValueMeasuredOnRecurringBasisNoncurrentInvestments
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Securities investments in an asset position which are held as available-for-sale and are not disclosed elsewhere in the table.

No definition available.

Name:	luv_FairValueMeasuredOnRecurringBasisOtherAvailableForSaleSecuritiesNetAsset
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

This element is used in connection with the fair value disclosures. It represents short-term certificates of deposit ("CDs"), which are FDIC insured investments available at banks and savings and loan institutions with maturities less than one year. Customers agree to lend money to the institutions for a certain amount of time. In exchange for doing so, the customer is paid a predetermined rate of interest. Often, banks will charge a penalty fee if the money is withdrawn from the CD before it matures.

No definition available.

Name:	luv_FairValueMeasuredOnRecurringBasisShortTermCertificatesOfDeposit
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

No definition available.

Name:	luv_FairValueMeasuredOnRecurringBasisShortTermCommericalPaper
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
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This category includes information about debt securities issued by the United States Department of the Treasury and backed by the United States government. Such securities primarily consist of treasury bills (short-term maturities - one year or less), treasury notes (intermediate term maturities - two to ten years), and treasury bonds (long-term maturities - ten to thirty years).

No definition available.

Name:	luv_FairValueMeasuredOnRecurringBasisUsTreasurySecurities
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

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Namespace Prefix:	luv_
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Period Type:	duration

No definition available.

Name:	luv_FrenchCreditAgreementsDue2018FairValueDisclosure
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

Name:	luv_FrenchCreditAgreementsDueForFairValueDisclosure
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Name:	luv_FuelDerivativeAssetsAbstract
Namespace Prefix:	luv_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	luv_FuelDerivativeLiabilityAbstract
Namespace Prefix:	luv_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	luv_NoncurrentInvestmentsAbstract
Namespace Prefix:	luv_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

No definition available.

Name:	luv_NotesDue2012FairValueDisclosure
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

Name:	luv_NotesDue2014FairValueDisclosure
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

Name:	luv_NotesDue2016FairValueDisclosure
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

Name:	luv_NotesDue2017FairValueDisclosure
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

A written promise to pay a note to a third party. Such obligations are due through 2017. Effective interest rate is 10.21 percent.

No definition available.

Name:	luv_NotesPayableAircraftFixedRateThrough2017
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

A written promise to pay a note to a third party. Such obligations are due through 2018. Effective interest rate is 7.02 percent.

No definition available.

Name:	luv_NotesPayableAircraftFixedRateThrough2018
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

A written promise to pay a note to a third party. Such obligations are due through 2020. Effective interest rate is 1.90 percent.

No definition available.

Name:	luv_NotesPayableAircraftFloatingRateThrough2020
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Name:	luv_NotesToFinancialStatementsAbstract
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No definition available.

Name:	luv_PassThroughCertificatesFairValueDisclosure
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Collateralized debt obligations due with maturities initially due after one year or beyond the operating cycle if longer, excluding current portion. Such obligations are due in 2019. Effective interest rate is 6.84 percent.

No definition available.

Name:	luv_TermLoanAgreementBDueForFairValueDisclosure
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Collateralized debt obligations with maturities initially due after one year or beyond the operating cycle if longer, excluding current portion. Such obligations are due in 2019. Effective interest rate is 6.315 percent.

No definition available.

Name:	luv_TermLoanAgreementDue2019FairValueDisclosure
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

Name:	luv_TermLoanAgreementDueForFairValueDisclosure
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

No definition available.

Name:	us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLosses1
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Name:	us-gaap_CashAndCashEquivalentsAbstract
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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

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-Name Accounting Standards Codification

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 7, 8, 9, 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 7

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 8

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets); the fair value of which assets and liabilities was or is measured on a recurring basis using significant unobservable inputs (Level 3).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

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This element represents total gains (losses) for the period (realized and unrealized), arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

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Sales that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

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Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
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Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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-Subparagraph (a)

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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

Name:	us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
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