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Debt - 2013, 2014 and 2016 Credit Facilities (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Nov. 30, 2017
Nov. 29, 2017
Aug. 31, 2017
Aug. 30, 2017
Jun. 30, 2017
Jun. 29, 2017
Mar. 31, 2017
Mar. 30, 2017
Aug. 31, 2017
Dec. 31, 2017
Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility undrawn fee percentage                   0.75%
Secured Debt [Member]                    
Debt Instrument [Line Items]                    
Minimum aggregate liquidity required under debt covenant                   $ 2,000,000,000
Secured Debt [Member] | Term Loan Facility [Member]                    
Debt Instrument [Line Items]                    
Annual installment repayment, percent or original principal balance                   1.00%
Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2013 [Member]                    
Debt Instrument [Line Items]                    
Debt instrument principal amount                   $ 1,900,000,000
Long-term debt outstanding             $ 1,800,000,000     $ 1,825,000,000
Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2013 [Member] | LIBOR [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate             2.00% 2.50%   2.00%
Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2013 [Member] | Base Rate [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate             1.00% 1.50%    
Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2014 [Member]                    
Debt Instrument [Line Items]                    
Debt instrument principal amount                   $ 750,000,000
Long-term debt outstanding         $ 735,000,000         $ 728,000,000
Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2014 [Member] | LIBOR [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate         2.00% 2.50%       2.00%
Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2014 [Member] | Base Rate [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate         1.00% 1.50%        
Secured Debt [Member] | Term Loan Facility [Member] | April 2016 Credit Facilities [Member]                    
Debt Instrument [Line Items]                    
Debt instrument principal amount                   $ 1,000,000,000
Long-term debt outstanding $ 990,000,000                 $ 990,000,000
Secured Debt [Member] | Term Loan Facility [Member] | April 2016 Credit Facilities [Member] | LIBOR [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 2.00% 2.50%               2.00%
Secured Debt [Member] | Term Loan Facility [Member] | April 2016 Credit Facilities [Member] | Base Rate [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 1.00% 1.50%                
Secured Debt [Member] | Term Loan Facility [Member] | December 2016 Credit Facilities [Member]                    
Debt Instrument [Line Items]                    
Debt instrument principal amount                   $ 1,250,000,000
Long-term debt outstanding $ 1,250,000,000                 $ 1,238,000,000
Secured Debt [Member] | Term Loan Facility [Member] | December 2016 Credit Facilities [Member] | LIBOR [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 2.00% 2.50%               2.00%
Secured Debt [Member] | Term Loan Facility [Member] | December 2016 Credit Facilities [Member] | Base Rate [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 1.00% 1.50%                
Secured Debt [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity                   $ 2,500,000,000
Secured Debt [Member] | Revolving Credit Facility [Member] | Credit Facility 2013 [Member]                    
Debt Instrument [Line Items]                    
Long-term debt outstanding                   0
Line of credit facility, maximum borrowing capacity     $ 1,200,000,000.0       $ 1,400,000,000.0   $ 1,200,000,000.0 $ 1,200,000,000
Secured Debt [Member] | Revolving Credit Facility [Member] | Credit Facility 2013 [Member] | LIBOR [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate     2.25% 3.00%           2.25%
Secured Debt [Member] | Revolving Credit Facility [Member] | Credit Facility 2014 [Member]                    
Debt Instrument [Line Items]                    
Long-term debt outstanding                   $ 0
Line of credit facility, maximum borrowing capacity     $ 1,000,000,000.0   $ 1,025,000,000.000       1,000,000,000.0 $ 1,000,000,000
Secured Debt [Member] | Revolving Credit Facility [Member] | Credit Facility 2014 [Member] | LIBOR [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate     2.25% 3.00%           2.25%
Secured Debt [Member] | Revolving Credit Facility [Member] | April 2016 Credit Facilities [Member]                    
Debt Instrument [Line Items]                    
Long-term debt outstanding                   $ 0
Line of credit facility, maximum borrowing capacity     $ 300,000,000           $ 300,000,000 $ 300,000,000
Secured Debt [Member] | Revolving Credit Facility [Member] | April 2016 Credit Facilities [Member] | LIBOR [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate                 2.25% 2.25%
Secured Debt [Member] | Letter of Credit [Member] | Credit Facility 2013 [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity                   $ 150,000,000
Secured Debt [Member] | Letter of Credit [Member] | Credit Facility 2014 [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity                   $ 300,000,000
American Airlines, Inc. [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility undrawn fee percentage                   0.75%
American Airlines, Inc. [Member] | Revolving Credit Facility [Member] | Credit Facility 2014 [Member] | LIBOR [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate     2.25% 3.00%            
American Airlines, Inc. [Member] | Revolving Credit Facility [Member] | April 2016 Credit Facilities [Member] | LIBOR [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate                 2.25%  
American Airlines, Inc. [Member] | Secured Debt [Member]                    
Debt Instrument [Line Items]                    
Minimum aggregate liquidity required under debt covenant                   $ 2,000,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member]                    
Debt Instrument [Line Items]                    
Annual installment repayment, percent or original principal balance                   1.00%
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2013 [Member]                    
Debt Instrument [Line Items]                    
Long-term debt outstanding             $ 1,800,000,000      
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2013 [Member] | LIBOR [Member]                    
Debt Instrument [Line Items]                    
Debt instrument principal amount                   $ 1,900,000,000
Long-term debt outstanding                   $ 1,825,000,000
Basis spread on variable rate             2.00% 2.50%   2.00%
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2013 [Member] | Base Rate [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate             1.00% 1.50%    
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2014 [Member]                    
Debt Instrument [Line Items]                    
Long-term debt outstanding         $ 735,000,000          
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2014 [Member] | LIBOR [Member]                    
Debt Instrument [Line Items]                    
Debt instrument principal amount                   $ 750,000,000
Long-term debt outstanding                   $ 728,000,000
Basis spread on variable rate         2.00% 2.50%       2.00%
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2014 [Member] | Base Rate [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate         1.00% 1.50%        
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | April 2016 Credit Facilities [Member]                    
Debt Instrument [Line Items]                    
Long-term debt outstanding $ 990,000,000                  
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | April 2016 Credit Facilities [Member] | LIBOR [Member]                    
Debt Instrument [Line Items]                    
Debt instrument principal amount                   $ 1,000,000,000
Long-term debt outstanding                   $ 990,000,000
Basis spread on variable rate 2.00% 2.50%               2.00%
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | April 2016 Credit Facilities [Member] | Base Rate [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 1.00% 1.50%                
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | December 2016 Credit Facilities [Member]                    
Debt Instrument [Line Items]                    
Long-term debt outstanding $ 1,250,000,000                  
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | December 2016 Credit Facilities [Member] | LIBOR [Member]                    
Debt Instrument [Line Items]                    
Debt instrument principal amount                   $ 1,250,000,000
Long-term debt outstanding                   $ 1,238,000,000
Basis spread on variable rate 2.00% 2.50%               2.00%
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | December 2016 Credit Facilities [Member] | Base Rate [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 1.00% 1.50%                
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity                   $ 2,500,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | Credit Facility 2013 [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity     $ 1,200,000,000.0       $ 1,400,000,000.0   $ 1,200,000,000.0 1,200,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | Credit Facility 2013 [Member] | LIBOR [Member]                    
Debt Instrument [Line Items]                    
Long-term debt outstanding                   $ 0
Basis spread on variable rate     2.25% 3.00%           2.25%
Line of credit facility, maximum borrowing capacity                   $ 1,200,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | Credit Facility 2014 [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity     $ 1,000,000,000.0   $ 1,025,000,000.000       1,000,000,000.0 1,000,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | Credit Facility 2014 [Member] | LIBOR [Member]                    
Debt Instrument [Line Items]                    
Long-term debt outstanding                   $ 0
Basis spread on variable rate                   2.25%
Line of credit facility, maximum borrowing capacity                   $ 1,000,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | April 2016 Credit Facilities [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity     $ 300,000,000           $ 300,000,000 300,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | April 2016 Credit Facilities [Member] | LIBOR [Member]                    
Debt Instrument [Line Items]                    
Long-term debt outstanding                   $ 0
Basis spread on variable rate                   2.25%
Line of credit facility, maximum borrowing capacity                   $ 300,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Letter of Credit [Member] | Credit Facility 2013 [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity                   150,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Letter of Credit [Member] | Credit Facility 2014 [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity                   $ 300,000,000