Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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The maximum additional number of assets pledged as collateral in case the Company has obligations related to its fuel derivative instruments with counterparties that exceed certain thresholds

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The net book value of additional assets pledged as collateral in case the Company has obligations related to its fuel derivative instruments with counterparties that exceed certain thresholds

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The price per share of the conversion feature embedded in the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized.

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The amount of the liability for the conversion option reclassified to stockholders' equity when the embedded option no longer required separation from the host instrument.

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Gross amount of debt extinguished.

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Long-term Debt (Details) (USD $)	12 Months Ended	1 Months Ended	12 Months Ended	0 Months Ended		3 Months Ended	0 Months Ended
Long-term Debt (Details) (USD $)	Dec. 31, 2014 Loans Mortgages	Oct. 31, 2009	Dec. 31, 2013	Apr. 29, 2009	May 06, 2008	Dec. 31, 2004 Agreements Mortgages	Feb. 28, 1997	Jul. 01, 2009 Mortgages	Oct. 03, 2007 Mortgages	Dec. 31, 2006	Feb. 28, 2005	Sep. 30, 2004	Jun. 30, 2014
Debt Instrument [Line Items]
Letters of Credit Outstanding Amount	440,000,000
Net book value of assets pledged as collateral for the Company's secured borrowings, primarily aircraft and engines	2,000,000,000
Maximum additional number of assets pledged as collateral in case obligations related to fuel derivatives exceed certain thresholds	81
Net book value of additional assets pledged as collateral in case obligations related to fuel derivatives exceed certain thresholds	2,000,000,000
Long-term Debt, by Maturity [Abstract]
2015	182,000,000
2016	610,000,000
2017	520,000,000
2018	264,000,000
2019	514,000,000
Thereafter	551,000,000
AirTran Airways
Debt Instrument [Line Items]
Number of mortgages on secured aircraft	22
AirTran Airways \| Interest rate derivatives
Debt Instrument [Line Items]
Notional amount	243,000,000
AirTran Airways \| Maximum \| Interest rate derivatives
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)	6.435%
Floating-rate 737 Aircraft Notes payable through 2020 \| AirTran Airways
Debt Instrument [Line Items]
Number of mortgages on secured aircraft	19
Number of loans prepaid during period	8
Weighted average interest rate	1.66%
Fixed-rate 737 Aircraft Notes payable through 2018 - 7.02% \| AirTran Airways
Debt Instrument [Line Items]
Weighted average interest rate	7.02%
5.25% Convertible Senior Notes due 2016
Debt Instrument [Line Items]
Conversion ratio		53.7747
Conversion price		$ 615.16
5.25% Convertible Senior Notes due 2016 \| AirTran Airways
Debt Instrument [Line Items]
Face amount of debt		115,000,000
Interest rate stated in the debt agreement (in hundredths)		5.25%
Conversion ratio		167.5224
Extinguishment of debt amount	5,000,000
Repurchase price percentage	100.00%
Conversion option, amount			35,000,000
Unamortized premium			10,000,000
5.25% Convertible Senior Notes due 2016 \| Southwest Airlines
Debt Instrument [Line Items]
Cash set aside for conversion	68,000,000
2.75% Unsecured Senior Notes Due 2019
Debt Instrument [Line Items]
Face amount of debt	300,000,000
Interest rate stated in the debt agreement (in hundredths)	2.75%
Term Loan Agreement due 2019 - 6.84%
Debt Instrument [Line Items]
Number of mortgages on secured aircraft								5
Interest rate stated in the debt agreement (in hundredths)								6.84%
Term Loan Agreement due 2019 - 6.84% \| Maximum
Debt Instrument [Line Items]
Face amount of debt								124,000,000
Term Loan Agreement due 2019 - 6.315%
Debt Instrument [Line Items]
Number of mortgages on secured aircraft				14
Interest rate stated in the debt agreement (in hundredths)				6.315%
Term Loan Agreement due 2019 - 6.315% \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate				3.30%
Term Loan Agreement due 2019 - 6.315% \| Maximum
Debt Instrument [Line Items]
Face amount of debt				332,000,000
Term Loan Agreement due 2020 - 5.223%
Debt Instrument [Line Items]
Number of mortgages on secured aircraft					21
Face amount of debt					600,000,000
Interest rate stated in the debt agreement (in hundredths)					5.223%
Term Loan Agreement due 2020 - 5.223% \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate					0.95%
Pass Through Certificates due 2022 - 6.24%
Debt Instrument [Line Items]
Number of mortgages on secured aircraft									16
Face amount of debt									500,000,000
Pass Through Certificates due 2022 - 6.24% \| Interest rate derivatives \| Cash Flow Hedging
Debt Instrument [Line Items]
Notional amount									20,000,000
Pass Through Certificates Series A
Debt Instrument [Line Items]
Face amount of debt									412,000,000
Interest rate stated in the debt agreement (in hundredths)									6.15%
Pass Through Certificates Series B
Debt Instrument [Line Items]
Face amount of debt									88,000,000
Interest rate stated in the debt agreement (in hundredths)									6.65%
5.75% Notes due 2016
Debt Instrument [Line Items]
Face amount of debt										300,000,000
Interest rate stated in the debt agreement (in hundredths)										5.75%
5.125% Notes due 2017
Debt Instrument [Line Items]
Face amount of debt											300,000,000
Interest rate stated in the debt agreement (in hundredths)											5.125%
French Credit Agreements due 2018 - 1.06%
Debt Instrument [Line Items]
Number of mortgages on secured aircraft						4
Face amount of debt						112,000,000
Number of identical floating rate financing agreements entered into concurrently with French banking partnerships						4
Term						13 years 0 months 0 days
French Credit Agreements due 2018 - 1.06% \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate						(45.00%)
5.25% Notes due 2014
Debt Instrument [Line Items]
Face amount of debt												350,000,000
7.375% Debentures due 2027
Debt Instrument [Line Items]
Face amount of debt							100,000,000
Interest rate stated in the debt agreement (in hundredths)							7.375%
7.375% Debentures due 2027 \| Treasury Rate
Debt Instrument [Line Items]
Spread on variable rate							20.00%
Enhanced Equipment Trust Certificate \| Fixed-rate 717 Aircraft Notes payable through 2017 - 10.37% \| AirTran Airways
Debt Instrument [Line Items]
Long-term Debt, Prepayment	7,000,000												35,000,000
Make Whole Penalty on Debt Extinguishment	6,000,000
Interest rate stated in the debt agreement (in hundredths)	10.37%
Unamortized premium													$ 5,000,000
Enhanced Equipment Trust Certificate \| Pass Through Certificates due 2022 - 6.24%
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)	6.24%