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Employee Benefit Plans - Schedule of One Percentage Point Change in Assumed Health Care Cost Trend Rates (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Increase (decrease) on service and interest cost, 1% Increase $ 1
Increase (decrease) on benefit obligation, 1% Increase 40
Increase (decrease) on service and interest cost, 1% Decrease (1)
Increase (decrease) on benefits obligation, 1% Decrease (40)
American Airlines, Inc. [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Increase (decrease) on service and interest cost, 1% Increase 1
Increase (decrease) on benefit obligation, 1% Increase 40
Increase (decrease) on service and interest cost, 1% Decrease (1)
Increase (decrease) on benefits obligation, 1% Decrease $ (40)