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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Periodic Benefit Cost (Income)
The following table provides the components of net periodic benefit cost (income) (in millions):
 Pension BenefitsRetiree Medical and Other
Postretirement Benefits
Three Months Ended September 30,2024202320242023
Service cost$— $1 $8 $4 
Interest cost180 188 17 12 
Expected return on assets(245)(230)(2)(2)
Amortization of:
Prior service cost (benefit)— 4 3 (3)
Unrecognized net loss (gain)26 25 (6)(10)
Net periodic benefit cost (income)$(39)$(12)$20 $1 
 Pension BenefitsRetiree Medical and Other
Postretirement Benefits
Nine Months Ended September 30,2024202320242023
Service cost$1 $2 $23 $10 
Interest cost542 568 51 36 
Expected return on assets(733)(690)(7)(7)
Amortization of:
Prior service cost (benefit)— 18 11 (10)
Unrecognized net loss (gain)79 80 (19)(27)
Net periodic benefit cost (income)$(111)$(22)$59 $2 
American Airlines, Inc.  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Periodic Benefit Cost (Income)
The following table provides the components of net periodic benefit cost (income) (in millions):
 Pension BenefitsRetiree Medical and Other
Postretirement Benefits
Three Months Ended September 30,2024202320242023
Service cost$— $— $8 $4 
Interest cost178 187 17 12 
Expected return on assets(243)(228)(2)(2)
Amortization of:
Prior service cost (benefit)— 4 3 (3)
Unrecognized net loss (gain)26 25 (6)(10)
Net periodic benefit cost (income)$(39)$(12)$20 $1 
 Pension BenefitsRetiree Medical and Other
Postretirement Benefits
Nine Months Ended September 30,2024202320242023
Service cost$1 $1 $23 $10 
Interest cost539 564 51 36 
Expected return on assets(729)(685)(7)(7)
Amortization of:
Prior service cost (benefit)— 18 11 (10)
Unrecognized net loss (gain)79 80 (19)(27)
Net periodic benefit cost (income)$(110)$(22)$59 $2