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Fair Value Measurements (Long Term Debt And Current Maturities) (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Secured Variable And Fixed Rate Indebtedness Due Through 2023 [Member]
Jun. 30, 2012
6.00% - 8.50% Special Facility Revenue Bonds Due Through 2036 [Member]
Jun. 30, 2012
Not Classified As Subject To Compromise [Member]
Dec. 31, 2011
Not Classified As Subject To Compromise [Member]
Jun. 30, 2012
Not Classified As Subject To Compromise [Member]
Secured Variable And Fixed Rate Indebtedness Due Through 2023 [Member]
Dec. 31, 2011
Not Classified As Subject To Compromise [Member]
Secured Variable And Fixed Rate Indebtedness Due Through 2023 [Member]
Jun. 30, 2012
Not Classified As Subject To Compromise [Member]
Enhanced Equipment Trust Certificates Due Through 2021 [Member]
Dec. 31, 2011
Not Classified As Subject To Compromise [Member]
Enhanced Equipment Trust Certificates Due Through 2021 [Member]
Jun. 30, 2012
Not Classified As Subject To Compromise [Member]
6.00% - 8.50% Special Facility Revenue Bonds Due Through 2036 [Member]
Dec. 31, 2011
Not Classified As Subject To Compromise [Member]
6.00% - 8.50% Special Facility Revenue Bonds Due Through 2036 [Member]
Jun. 30, 2012
Not Classified As Subject To Compromise [Member]
7.50% Senior Secured Notes Due 2016 [Member]
Dec. 31, 2011
Not Classified As Subject To Compromise [Member]
7.50% Senior Secured Notes Due 2016 [Member]
Jun. 30, 2012
Not Classified As Subject To Compromise [Member]
Advantage Miles Advance Purchase [Member]
Dec. 31, 2011
Not Classified As Subject To Compromise [Member]
Advantage Miles Advance Purchase [Member]
Jun. 30, 2012
Not Classified As Subject To Compromise [Member]
Other LT Debt [Member]
Dec. 31, 2011
Not Classified As Subject To Compromise [Member]
Other LT Debt [Member]
Jun. 30, 2012
Classified As Subject to Compromise [Member]
Dec. 31, 2011
Classified As Subject to Compromise [Member]
Jun. 30, 2012
Classified As Subject to Compromise [Member]
Secured Variable And Fixed Rate Indebtedness Due Through 2023 [Member]
Dec. 31, 2011
Classified As Subject to Compromise [Member]
Secured Variable And Fixed Rate Indebtedness Due Through 2023 [Member]
Jun. 30, 2012
Classified As Subject to Compromise [Member]
Enhanced Equipment Trust Certificates Due Through 2021 [Member]
Dec. 31, 2011
Classified As Subject to Compromise [Member]
Enhanced Equipment Trust Certificates Due Through 2021 [Member]
Jun. 30, 2012
Classified As Subject to Compromise [Member]
6.00% - 8.50% Special Facility Revenue Bonds Due Through 2036 [Member]
Dec. 31, 2011
Classified As Subject to Compromise [Member]
6.00% - 8.50% Special Facility Revenue Bonds Due Through 2036 [Member]
Jun. 30, 2012
Classified As Subject to Compromise [Member]
7.50% Senior Secured Notes Due 2016 [Member]
Dec. 31, 2011
Classified As Subject to Compromise [Member]
7.50% Senior Secured Notes Due 2016 [Member]
Jun. 30, 2012
Classified As Subject to Compromise [Member]
Advantage Miles Advance Purchase [Member]
Dec. 31, 2011
Classified As Subject to Compromise [Member]
Advantage Miles Advance Purchase [Member]
Debt Instrument [Line Items]                                                        
Carrying Value     $ 7,949 $ 8,247 $ 2,769 $ 2,952 $ 1,869 $ 1,942 $ 1,437 $ 1,436 $ 1,000 $ 1,000 $ 846 $ 890 $ 28 $ 27 $ 1,469 $ 1,642 $ 1,283 $ 1,456 $ 0 $ 0 $ 186 $ 186 $ 0 $ 0 $ 0 $ 0
Fair Value     $ 7,932 $ 7,444 $ 2,665 $ 2,647 $ 1,972 $ 1,927 $ 1,478 $ 1,230 $ 941 $ 711 $ 848 $ 902 $ 28 $ 27 $ 1,232 $ 1,160 $ 1,133 $ 1,123 $ 0 $ 0 $ 99 $ 37 $ 0 $ 0 $ 0 $ 0
Effective interest rate percentage - minimum 1.00%                                                      
Effective interest rate percentage - maximum 13.00%                                                      
Percentage of debt instrument interest rate - minimum   5.10%                                                    
Percentage of debt instrument interest rate - maximum   10.38%