LONG-TERM DEBT (Details) (USD $)	0 Months Ended
Sep. 30, 2011	Dec. 31, 2010
Notes to Financial Statements [Abstract]
Net book value of assets pledged as collateral for the company's secured borrowings, primarily aircraft and engines	$ 922,000,000
Long-term Debt, by Maturity [Abstract]
Long Term Debt And Capital Lease Maturities Repayments Of Principal Remainder Of Year	24,000,000
Long Term Debt And Capital Lease Maturities Repayments Of Principal In Year One After Current Year	66,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Two	77,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	76,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	90,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	193,000,000
Long-term Debt, Maturities, Repayments of Principal after Year Five	320,000,000
Line Of Credit, Amount Terminated	100,000,000
Debt assumed in aquisition	1,100,000,000
Conversion option, amount	35,000,000
Debt Instrument, Unamortized Premium	10,000,000
Debt Instrument [Line Items]
Latest maturity date	2017
Less current maturities	986,000,000	505,000,000
Long-term debt less current maturities	3,220,000,000	2,875,000,000
Derivative, Higher Remaining Maturity Range	2020
Derivative, Lower Remaining Maturity Range	2016
AirTran Airways [Member] \| Floating-rate B737 aircraft notes payable through 2020 [Member]
Debt Instrument [Line Items]
Collateral to secure loan	note is secured by a first mortgage on the aircraft to which it relates first mortgage on the aircraft to which it relates
Carrying amount of debt	616,000,000
Number of mortgages on secured aircraft	27
Earliest maturity date	2016
Latest maturity date	2020
Weighted average interest rate	1.91%
AirTran Airways [Member] \| Fixed-rate B737 aircraft notes payable through 2018 [Member]
Debt Instrument [Line Items]
Carrying amount of debt	43,000,000
Number of mortgages on secured aircraft	3
Latest maturity date	2018
Interest rate stated in the debt agreement (in hundredths)	7.02%
Fixed-rate B737 aircraft notes payable through 2018 [Member]
Debt Instrument [Line Items]
Earliest maturity date	2016
AirTran Airways [Member] \| Fixed-rate B717 aircraft notes payable through 2017 [Member]
Debt Instrument [Line Items]
Carrying amount of debt	78,000,000
Number of mortgages on secured aircraft	8
Latest maturity date	April 2017
Weighted average interest rate	10.23%
5.5% Convertible Debt due 2015 [Member]
Debt Instrument [Line Items]
Face amount of debt	70,000,000
Latest maturity date	2015
Interest rate stated in the debt agreement (in hundredths)	5.50%
Shares issued for conversions of debt	6,200,000
Cash paid for conversions of debt	73,000,000
7.0% Convertible Debt Due 2023 [Member]
Debt Instrument [Line Items]
Face amount of debt	5,000,000
Latest maturity date	2023
Interest rate stated in the debt agreement (in hundredths)	7.00%
AirTran Airways [Member] \| 5.25% Convertible Debt Due 2016 [Member]
Debt Instrument [Line Items]
Issuance date of debt	October 2009
Face amount of debt	115,000,000
Carrying amount of debt	119,000,000
Interest rate stated in the debt agreement (in hundredths)	5.25%
Conversion ratio	164.136
Extinguishment of Debt, Amount	5,000,000
5.25% Convertible Debt Due 2016 [Member]
Debt Instrument [Line Items]
Face amount of debt	115,000,000
Latest maturity date	2016
5.25% Convertible Debt Due 2016 [Member] \| Southwest Airlines Co. [Member]
Debt Instrument [Line Items]
Conversion ratio	52.6877
Conversion Price	$ 615.17
AirTran Airways [Member]
Debt Instrument [Line Items]
Carrying amount of debt	856,000,000
Less current maturities	(75,000,000)
Long-term debt less current maturities	$ 781,000,000

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- Definition

Amount of long-term debt maturing in year three following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

+ References

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- Definition

Amount of long-term debt maturing in year two following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates.

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- Definition

Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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

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- Definition

The sum of the fair values, as of the date of each statement of financial position presented, of securities that are restricted as collateral for the payment of related debt obligations, primarily secured borrowings and repurchase agreements, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 15

-Subparagraph a

-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 860

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728

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