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Retirement Benefits - Schedule of Accumulated Benefit Obligations Exceeding Fair Value of Plan Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation (PBO) $ 16,369 $ 17,560
Accumulated benefit obligation (ABO) 16,357 17,548
Fair value of plan assets 9,677 10,950
ABO less fair value of plan assets 6,680 6,598
Pension Benefits [Member] | American Airlines, Inc. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation (PBO) 16,283 17,471
Accumulated benefit obligation (ABO) 16,272 17,461
Fair value of plan assets 9,630 10,899
ABO less fair value of plan assets 6,642 6,562
Retiree Medical And Other Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated postretirement benefit obligation (APBO) 1,129 1,324
Fair value of plan assets 253 244
Retiree Medical And Other Postretirement Benefits [Member] | American Airlines, Inc. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated postretirement benefit obligation (APBO) 1,129 1,324
Fair value of plan assets $ 253 $ 244