v3.26.1
Employee Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 1 $ 1 $ 1
Interest cost 177 183 353 367
Expected return on assets (230) (232) (459) (464)
Amortization of:        
Prior service cost 0 0 0 0
Unrecognized net loss (gain) 22 24 44 47
Net periodic benefit cost (income) (30) (24) (61) (49)
Pension Benefits | American Airlines, Inc.        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 1 1
Interest cost 175 182 351 364
Expected return on assets (228) (231) (456) (460)
Amortization of:        
Prior service cost 0 0 0 0
Unrecognized net loss (gain) 22 24 44 47
Net periodic benefit cost (income) (30) (24) (60) (48)
Retiree Medical and Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 6 6 11 12
Interest cost 16 18 32 35
Expected return on assets (2) (2) (4) (5)
Amortization of:        
Prior service cost 4 4 9 9
Unrecognized net loss (gain) (5) (6) (11) (11)
Net periodic benefit cost (income) 19 20 37 40
Retiree Medical and Other Postretirement Benefits | American Airlines, Inc.        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 6 6 11 12
Interest cost 16 18 32 35
Expected return on assets (2) (2) (4) (5)
Amortization of:        
Prior service cost 4 4 9 9
Unrecognized net loss (gain) (5) (6) (11) (11)
Net periodic benefit cost (income) $ 19 $ 20 $ 37 $ 40