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Leases (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
aircraft
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
aircraft
Dec. 31, 2016
USD ($)
aircraft
CapitalLeases
Dec. 31, 2015
USD ($)
Jul. 09, 2012
aircraft
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]            
Flight equipment $ 1,207,000,000   $ 1,207,000,000 $ 923,000,000    
Less: accumulated amortization 172,000,000   172,000,000 82,000,000    
Total 1,035,000,000   1,035,000,000 $ 841,000,000    
Capital Leased Assets [Line Items]            
2018 107,000,000   107,000,000      
2019 106,000,000   106,000,000      
2020 105,000,000   105,000,000      
2021 100,000,000   100,000,000      
2022 96,000,000   96,000,000      
Thereafter 416,000,000   416,000,000      
Total minimum lease payments 930,000,000   930,000,000      
Less amount representing interest 150,000,000   150,000,000      
Present value of minimum lease payments (a) [1] 780,000,000   780,000,000      
Less current portion 79,000,000   79,000,000      
Long-term portion $ 701,000,000   $ 701,000,000      
Number of capital leased assets 69   69 51    
Rental expense for operating leases     $ 939,000,000 $ 932,000,000 $ 909,000,000  
Total Classic aircraft retired in 2017 | aircraft     87      
Remaining -300 aircraft grounded in September 2017 | aircraft     61      
Subleases            
2018 $ (102,000,000)   $ (102,000,000)      
2019 (98,000,000)   (98,000,000)      
2020 (78,000,000)   (78,000,000)      
2021 (41,000,000)   (41,000,000)      
2022 (17,000,000)   (17,000,000)      
Thereafter (8,000,000)   (8,000,000)      
Total minimum lease payments (344,000,000)   (344,000,000)      
Operating Leased Assets [Line Items]            
Lease Incentive Obligation Excluded 105,000,000   105,000,000      
Number of operating leased assets | aircraft       83    
Operating leases (b)            
2018 257,000,000   257,000,000      
2019 233,000,000   233,000,000      
2020 186,000,000   186,000,000      
2021 114,000,000   114,000,000      
2022 68,000,000   68,000,000      
Thereafter 169,000,000   169,000,000      
Total minimum lease payments 1,027,000,000   1,027,000,000      
2018 [2] 359,000,000   359,000,000      
2019 [2] 331,000,000   331,000,000      
2020 [2] 264,000,000   264,000,000      
2021 [2] 155,000,000   155,000,000      
2022 [2] 85,000,000   85,000,000      
Thereafter [2] 177,000,000   177,000,000      
Total minimum lease payments [2] $ 1,371,000,000   1,371,000,000      
Aircraft grounding charge   $ 63,000,000 $ 63,000,000 $ 0 $ 0  
Minimum            
Capital Leased Assets [Line Items]            
Renewal term     1 year      
Maximum            
Capital Leased Assets [Line Items]            
Renewal term     5 years      
B737-300            
Operating Leased Assets [Line Items]            
Number of operating leased assets | aircraft 15   15      
B-717-200            
Capital Leased Assets [Line Items]            
Number of capital leased assets | aircraft 2   2      
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      
Operating Leased Assets [Line Items]            
Number of operating leased assets | aircraft 76   76      
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          
Property Subject to Operating Lease [Member]            
Operating Leased Assets [Line Items]            
Number of operating leased assets | aircraft 53   53      
Property Available for Operating Lease [Member]            
Operating Leased Assets [Line Items]            
Number of operating leased assets | aircraft 144   144      
[1] Excludes lease incentive obligation of $105 million.
[2] Includes 15 remaining Classic aircraft on operating leases, which net remaining lease payments were included in the $63 million grounding charge recorded during 2017.