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Supplemental Financial Information - Other Assets (Details) (USD $)
In Millions, unless otherwise specified

Mar. 31, 2015

Dec. 31, 2014

Other Assets [Abstract]

Asset derivative contracts, net

$ 4luv_DerivativeAssetFairValueAmountOffsetAgainstCollateralTotal

$ 13luv_DerivativeAssetFairValueAmountOffsetAgainstCollateralTotal

Intangible assets

479us-gaap_IntangibleAssetsNetExcludingGoodwill

^[1]

363us-gaap_IntangibleAssetsNetExcludingGoodwill

^[1]

Non-current investments

31us-gaap_AvailableForSaleSecuritiesNoncurrent

35us-gaap_AvailableForSaleSecuritiesNoncurrent

Other

109us-gaap_OtherAssetsMiscellaneous

123us-gaap_OtherAssetsMiscellaneous

Other assets

623us-gaap_OtherAssets

534us-gaap_OtherAssets

Accrued Liabilities | Fuel derivatives

Other Assets [Abstract]

Asset derivative contracts, net

0luv_DerivativeAssetFairValueAmountOffsetAgainstCollateralTotal
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^[2]

0luv_DerivativeAssetFairValueAmountOffsetAgainstCollateralTotal
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^[2]

Other Assets | Interest rate derivatives

Other Assets [Abstract]

Asset derivative contracts, net

$ 4luv_DerivativeAssetFairValueAmountOffsetAgainstCollateralTotal
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^[2]

$ 13luv_DerivativeAssetFairValueAmountOffsetAgainstCollateralTotal
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^[2]

[1]

(a) Intangible assets primarily consist of acquired leasehold rights to certain airport owned gates at Chicago’s Midway International Airport, take-off and landing slots (a “slot” is the right of an air carrier, pursuant to regulations of the Federal Aviation Administration (“FAA”), to operate a takeoff or landing at a specific time at certain airports) at certain domestic slot-controlled airports, and certain intangible assets recognized from the AirTran acquisition. The increase in Intangible assets during 2015 was primarily due to the acquisition of two additional airport gate rights at Dallas Love Field, which were subleased from United. The purchase price paid for these airport gate rights was included as a component of Capital expenditures in the accompanying unaudited Condensed Consolidated Statement of Cash Flows.

[2]

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.

X

- 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.

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- Definition

Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562



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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph ((a)(1),(b))

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 7

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