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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 1 $ 2 $ 2
Interest cost 169 180 507 541
Expected return on assets (226) (198) (678) (592)
Amortization of:        
Prior service cost (benefit) 7 7 21 21
Unrecognized net loss (gain) 36 36 108 108
Net periodic benefit cost (income) (13) 26 (40) 80
Retiree Medical and Other Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 3 3
Interest cost 9 10 26 29
Expected return on assets (6) (5) (17) (16)
Amortization of:        
Prior service cost (benefit) (59) (59) (178) (178)
Unrecognized net loss (gain) (5) (6) (15) (17)
Net periodic benefit cost (income) (60) (59) (181) (179)
American Airlines, Inc. [Member] | Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 0 2 1
Interest cost 168 179 504 538
Expected return on assets (225) (197) (675) (589)
Amortization of:        
Prior service cost (benefit) 7 7 21 21
Unrecognized net loss (gain) 35 36 107 108
Net periodic benefit cost (income) (14) 25 (41) 79
American Airlines, Inc. [Member] | Retiree Medical and Other Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 3 3
Interest cost 9 10 26 29
Expected return on assets (6) (5) (17) (16)
Amortization of:        
Prior service cost (benefit) (59) (59) (178) (178)
Unrecognized net loss (gain) (5) (6) (15) (17)
Net periodic benefit cost (income) $ (60) $ (59) $ (181) $ (179)