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Leases (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
aircraft
CapitalLeases
Sep. 30, 2013
USD ($)
Dec. 31, 2016
USD ($)
aircraft
CapitalLeases
Dec. 31, 2015
USD ($)
aircraft
CapitalLeases
Dec. 31, 2014
USD ($)
Jul. 09, 2012
aircraft
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]            
Flight equipment $ 923,000,000   $ 923,000,000 $ 435,000,000    
Less: accumulated amortization 82,000,000   82,000,000 29,000,000    
Total 841,000,000   841,000,000 $ 406,000,000    
Capital Leased Assets [Line Items]            
2017 80,000,000   80,000,000      
2018 80,000,000   80,000,000      
2019 78,000,000   78,000,000      
2020 78,000,000   78,000,000      
2021 74,000,000   74,000,000      
Thereafter 353,000,000   353,000,000      
Total minimum lease payments 743,000,000   743,000,000      
Less amount representing interest 128,000,000   128,000,000      
Present value of minimum lease payments (a) [1] 615,000,000   615,000,000      
Less current portion 58,000,000   58,000,000      
Long-term portion $ 557,000,000   $ 557,000,000      
Number of capital leased assets | CapitalLeases 51   51 28    
Rental expense for operating leases     $ 932,000,000 $ 909,000,000 $ 931,000,000  
Number of operating leased assets | aircraft 83   83      
Subleases            
2017 $ (103,000,000)   $ (103,000,000)      
2018 (102,000,000)   (102,000,000)      
2019 (97,000,000)   (97,000,000)      
2020 (78,000,000)   (78,000,000)      
2021 (41,000,000)   (41,000,000)      
Thereafter (26,000,000)   (26,000,000)      
Total minimum lease payments (447,000,000)   (447,000,000)      
Operating Leased Assets [Line Items]            
Lease Incentive Obligation Excluded 66,000,000   66,000,000      
Construction Obligation not yet placed in service 414,000,000   414,000,000      
Operating leases            
2017 592,000,000   592,000,000      
2018 485,000,000   485,000,000      
2019 419,000,000   419,000,000      
2020 325,000,000   325,000,000      
2021 217,000,000   217,000,000      
Thereafter 1,297,000,000   1,297,000,000      
Total minimum lease payments 3,335,000,000   3,335,000,000      
2017 [2] 671,000,000   671,000,000      
2018 [2] 562,000,000   562,000,000      
2019 [2] 491,000,000   491,000,000      
2020 [2] 377,000,000   377,000,000      
2021 [2] 232,000,000   232,000,000      
Thereafter [2] 715,000,000   715,000,000      
Total minimum lease payments [2] 3,048,000,000   $ 3,048,000,000      
Minimum            
Capital Leased Assets [Line Items]            
Renewal term     1 year      
Maximum            
Capital Leased Assets [Line Items]            
Renewal term     5 years      
Love Field Airport            
Operating leases            
2017 [1] 24,000,000   $ 24,000,000      
2018 [1] 25,000,000   25,000,000      
2019 [1] 25,000,000   25,000,000      
2020 [1] 26,000,000   26,000,000      
2021 [1] 26,000,000   26,000,000      
Thereafter [1] 608,000,000   608,000,000      
Total minimum lease payments [1] $ 734,000,000   $ 734,000,000      
B-717-200            
Capital Leased Assets [Line Items]            
Number of capital leased assets | aircraft 2   2 1    
Number of operating leased assets | aircraft 76   76      
Number of aircrafts subleased | aircraft           88
Number of owned assets | aircraft 10   10      
Lease terms for owned aircraft 6 years          
Contingent rental payment due $ 0   $ 0      
Residual value of leased properties $ 0   $ 0      
Estimated Loss On Sublease   $ 137,000,000        
Additional Estimated Loss on Sublease       $ 22,000,000    
Grounding Loss on Sublease       $ 9,000,000    
B-717-200 | Minimum            
Capital Leased Assets [Line Items]            
Sublease terms 2 years          
B-717-200 | Maximum            
Capital Leased Assets [Line Items]            
Sublease terms 7 years          
[1] Excludes lease incentive obligation of $66 million.
[2] Includes a portion of the Company's Construction obligation that has not yet been placed into service as of December 31, 2016.