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Subsequent Events - Additional Information (Detail)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 26, 2017
USD ($)
Debt_Instruments
$ / shares
Sep. 30, 2017
$ / shares
Jun. 30, 2017
$ / shares
Mar. 31, 2017
$ / shares
Sep. 30, 2016
$ / shares
Sep. 30, 2017
$ / shares
Sep. 30, 2016
$ / shares
Subsequent Event [Line Items]              
Common stock dividends per share declared (in dollars per share) | $ / shares   $ 0.10 $ 0.10 $ 0.10 $ 0.10 $ 0.30 $ 0.30
Subsequent Event [Member]              
Subsequent Event [Line Items]              
Common stock dividends per share declared (in dollars per share) | $ / shares $ 0.10            
Subsequent Event [Member] | Enhanced Equipment Trust Certificates (EETC) [Member] | 2016-3 Class B EETC [Member]              
Subsequent Event [Line Items]              
Number of pass-through trusts issued | Debt_Instruments 1            
Debt instrument, aggregate principal issued | $ $ 193            
Debt instrument, stated interest rate percentage 3.75%            
Subsequent Event [Member] | Enhanced Equipment Trust Certificates (EETC) [Member] | 2017-2 Class B EETC [Member]              
Subsequent Event [Line Items]              
Number of pass-through trusts issued | Debt_Instruments 1            
Debt instrument, aggregate principal issued | $ $ 221            
Debt instrument, stated interest rate percentage 3.70%            
American Airlines, Inc. [Member] | Subsequent Event [Member] | Enhanced Equipment Trust Certificates (EETC) [Member] | 2016-3 Class B EETC [Member]              
Subsequent Event [Line Items]              
Number of pass-through trusts issued | Debt_Instruments 1            
Debt instrument, aggregate principal issued | $ $ 193            
Debt instrument, stated interest rate percentage 3.75%            
American Airlines, Inc. [Member] | Subsequent Event [Member] | Enhanced Equipment Trust Certificates (EETC) [Member] | 2017-2 Class B EETC [Member]              
Subsequent Event [Line Items]              
Number of pass-through trusts issued | Debt_Instruments 1            
Debt instrument, aggregate principal issued | $ $ 221            
Debt instrument, stated interest rate percentage 3.70%