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Employee Benefit Plans - Schedule of Accumulated Benefit Obligations Exceeding Fair Value of Plan Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation (PBO) $ 17,209 $ 16,369
Accumulated benefit obligation (ABO) 17,197 16,357
Fair value of plan assets 9,986 9,677
ABO less fair value of plan assets 7,211 6,680
Pension Benefits [Member] | American Airlines, Inc. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation (PBO) 17,119 16,283
Accumulated benefit obligation (ABO) 17,108 16,272
Fair value of plan assets 9,936 9,630
ABO less fair value of plan assets 7,172 6,642
Retiree Medical And Other Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated postretirement benefit obligation (APBO) 990 1,129
Fair value of plan assets 266 253
Retiree Medical And Other Postretirement Benefits [Member] | American Airlines, Inc. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated postretirement benefit obligation (APBO) 990 1,129
Fair value of plan assets $ 266 $ 253