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Leases (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
aircraft
Sep. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
aircraft
Dec. 31, 2017
USD ($)
aircraft
CapitalLeases
Dec. 31, 2016
USD ($)
Jul. 09, 2012
aircraft
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]            
Flight equipment $ 1,329,000,000   $ 1,329,000,000 $ 1,207,000,000    
Less: accumulated amortization 304,000,000   304,000,000 172,000,000    
Total 1,025,000,000   1,025,000,000 $ 1,035,000,000    
Capital Leased Assets [Line Items]            
2019 111,000,000   111,000,000      
2020 109,000,000   109,000,000      
2021 105,000,000   105,000,000      
2022 100,000,000   100,000,000      
2023 97,000,000   97,000,000      
Thereafter 335,000,000   335,000,000      
Total minimum lease payments 857,000,000   857,000,000      
Less amount representing interest 126,000,000   126,000,000      
Present value of minimum lease payments (a) [1] 731,000,000   731,000,000      
Less current portion 85,000,000   85,000,000      
Long-term portion $ 646,000,000   $ 646,000,000      
Number of capital leased assets 72   72 69    
Rental expense for operating leases     $ 935,000,000 $ 939,000,000 $ 932,000,000  
Total Classic aircraft retired in 2017 | aircraft       87    
Remaining -300 aircraft grounded in September 2017 | aircraft       61    
Subleases            
2018 $ (92,000,000)   (92,000,000)      
2019 (78,000,000)   (78,000,000)      
2020 (41,000,000)   (41,000,000)      
2021 (17,000,000)   (17,000,000)      
2022 (7,000,000)   (7,000,000)      
Thereafter (1,000,000)   (1,000,000)      
Total minimum lease payments (236,000,000)   (236,000,000)      
Operating Leased Assets [Line Items]            
Lease Incentive Obligation Excluded $ 114,000,000   $ 114,000,000      
Number of operating leased assets | aircraft 51   51 53    
Operating leases            
2019 $ 256,000,000   $ 256,000,000      
2020 279,000,000   279,000,000      
2021 203,000,000   203,000,000      
2022 155,000,000   155,000,000      
2023 139,000,000   139,000,000      
Thereafter 473,000,000   473,000,000      
Total minimum lease payments 1,505,000,000   1,505,000,000      
2019 348,000,000   348,000,000      
2020 357,000,000   357,000,000      
2021 244,000,000   244,000,000      
2022 172,000,000   172,000,000      
2023 146,000,000   146,000,000      
Thereafter 474,000,000   474,000,000      
Total minimum lease payments $ 1,741,000,000   1,741,000,000      
Aircraft grounding charge   $ 63,000,000 $ 0 $ 63,000,000 $ 0  
Minimum            
Capital Leased Assets [Line Items]            
Renewal term 1 year   1 year      
Maximum            
Capital Leased Assets [Line Items]            
Renewal term 5 years   5 years      
Property Subject to Operating Lease [Member]            
Operating Leased Assets [Line Items]            
Number of operating leased assets | aircraft 51   51      
Property Available for Operating Lease [Member]            
Operating Leased Assets [Line Items]            
Number of operating leased assets | aircraft 124   124      
B-717-200            
Capital Leased Assets [Line Items]            
Number of capital leased assets | aircraft 2   2      
Number of owned assets | aircraft 10   10      
Lease terms for owned aircraft 4 years          
Contingent rental payment due $ 0   $ 0      
Residual value of leased properties $ 0   $ 0      
Operating Leased Assets [Line Items]            
Property Subject To Or Available For Lease, Number Of Units, Total | aircraft           88
Number of operating leased assets | aircraft 73   73      
B-717-200 | Minimum            
Capital Leased Assets [Line Items]            
Sublease terms 1 year          
B-717-200 | Maximum            
Capital Leased Assets [Line Items]            
Sublease terms 6 years          
Expired | B-717-200            
Operating Leased Assets [Line Items]            
Property Subject To Or Available For Lease, Number Of Units, Total | aircraft           3
[1] Excludes lease incentive obligation of $114 million.