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Debt - 2013, 2014 and 2016 Credit Facilities (Details) - USD ($)
 1 Months Ended 12 Months Ended
Nov. 30, 2018
Apr. 30, 2018
Dec. 31, 2018
May 31, 2018
Nov. 30, 2017
Oct. 31, 2017
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]                  
Long-term debt, net of current maturities     $ 20,566,000,000       $ 20,566,000,000   $ 21,818,000,000
Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility undrawn fee percentage             0.625%    
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] | 2013 Credit Facilities [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, net of current maturities     1,825,000,000 $ 1,800,000,000     $ 1,825,000,000    
Debt instrument principal amount     1,900,000,000       $ 1,900,000,000    
Secured Debt [Member] | Term Loan Facility [Member] | 2013 Credit Facilities [Member] | LIBOR [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate   2.00%   1.75%     1.75%    
Secured Debt [Member] | Term Loan Facility [Member] | 2013 Credit Facilities [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate   1.00%   0.75%          
Secured Debt [Member] | Term Loan Facility [Member] | 2014 Credit Facilities [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, net of current maturities     1,215,000,000       $ 1,215,000,000    
Line of credit facility, incremental loan feature               $ 500,000,000  
Debt instrument principal amount     1,250,000,000       $ 1,250,000,000    
Secured Debt [Member] | Term Loan Facility [Member] | 2014 Credit Facilities [Member] | LIBOR [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate             2.00%    
Secured Debt [Member] | Term Loan Facility [Member] | April 2016 Credit Facilities [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, net of current maturities     980,000,000       $ 980,000,000    
Debt instrument principal amount     1,000,000,000       $ 1,000,000,000    
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%    
Secured Debt [Member] | Term Loan Facility [Member] | December 2016 Credit Facilities [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, net of current maturities     1,225,000,000   $ 1,300,000,000   $ 1,225,000,000    
Debt instrument principal amount     1,250,000,000       $ 1,250,000,000    
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     2,842,500,000.0       $ 2,842,500,000.0    
Secured Debt [Member] | Revolving Credit Facility [Member] | 2013 Credit Facilities [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, net of current maturities     0       0    
Reduced commitments     200,000,000       200,000,000    
Line of credit facility, maximum borrowing capacity     $ 1,000,000,000       $ 1,000,000,000    
Secured Debt [Member] | Revolving Credit Facility [Member] | 2013 Credit Facilities [Member] | LIBOR [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 2.25%   2.00%       2.00%    
Secured Debt [Member] | Revolving Credit Facility [Member] | 2013 Credit Facilities [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 1.25%   1.00%            
Secured Debt [Member] | Revolving Credit Facility [Member] | 2014 Credit Facilities [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, net of current maturities     $ 0       $ 0    
Line of credit facility, incremental loan feature     543,000,000       543,000,000    
Line of credit facility, maximum borrowing capacity     $ 1,542,500,000.0       $ 1,542,500,000.0    
Secured Debt [Member] | Revolving Credit Facility [Member] | 2014 Credit Facilities [Member] | LIBOR [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 2.25%   2.00%       2.00%    
Secured Debt [Member] | Revolving Credit Facility [Member] | 2014 Credit Facilities [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 1.25%   1.00%            
Secured Debt [Member] | Revolving Credit Facility [Member] | April 2016 Credit Facilities [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, net of current maturities     $ 0       $ 0    
Line of credit facility, maximum borrowing capacity     $ 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%   2.00%       2.00%    
Secured Debt [Member] | Revolving Credit Facility [Member] | April 2016 Credit Facilities [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 1.25%   1.00%            
Secured Debt [Member] | Letter of Credit [Member] | 2013 Credit Facilities [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity     $ 100,000,000       $ 100,000,000    
Secured Debt [Member] | Letter of Credit [Member] | 2014 Credit Facilities [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity     200,000,000       200,000,000    
American Airlines, Inc. [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, net of current maturities     20,037,000,000       $ 20,037,000,000   $ 20,543,000,000
American Airlines, Inc. [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility undrawn fee percentage             0.625%    
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] | 2013 Credit Facilities [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, net of current maturities       $ 1,800,000,000          
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | 2013 Credit Facilities [Member] | LIBOR [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, net of current maturities     1,825,000,000       $ 1,825,000,000    
Basis spread on variable rate   2.00%   1.75%     1.75%    
Debt instrument principal amount     1,900,000,000       $ 1,900,000,000    
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | 2013 Credit Facilities [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate   1.00%   0.75%          
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | 2014 Credit Facilities [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, net of current maturities     1,200,000,000       1,200,000,000    
Line of credit facility, incremental loan feature               $ 500,000,000  
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | 2014 Credit Facilities [Member] | LIBOR [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, net of current maturities     1,215,000,000       $ 1,215,000,000    
Basis spread on variable rate             2.00%    
Debt instrument principal amount     1,250,000,000       $ 1,250,000,000    
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | April 2016 Credit Facilities [Member] | LIBOR [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, net of current maturities     980,000,000       $ 980,000,000    
Basis spread on variable rate             2.00%    
Debt instrument principal amount     1,000,000,000       $ 1,000,000,000    
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | December 2016 Credit Facilities [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, net of current maturities         $ 1,300,000,000        
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | December 2016 Credit Facilities [Member] | LIBOR [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, net of current maturities     1,225,000,000       $ 1,225,000,000    
Basis spread on variable rate         2.00% 2.50% 2.00%    
Debt instrument principal amount     1,250,000,000       $ 1,250,000,000    
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     2,842,500,000.0       2,842,500,000.0    
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | 2013 Credit Facilities [Member]                  
Debt Instrument [Line Items]                  
Reduced commitments     200,000,000       200,000,000    
Line of credit facility, maximum borrowing capacity     1,000,000,000       1,000,000,000    
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | 2013 Credit Facilities [Member] | LIBOR [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, net of current maturities     $ 0       $ 0    
Basis spread on variable rate 2.25%   2.00%       2.00%    
Line of credit facility, maximum borrowing capacity     $ 1,000,000,000       $ 1,000,000,000    
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | 2013 Credit Facilities [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 1.25%   1.00%            
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | 2014 Credit Facilities [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, incremental loan feature     $ 543,000,000       543,000,000    
Line of credit facility, maximum borrowing capacity     1,542,500,000.0       1,542,500,000.0    
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | 2014 Credit Facilities [Member] | LIBOR [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, net of current maturities     $ 0       $ 0    
Basis spread on variable rate 2.25%   2.00%       2.00%    
Line of credit facility, maximum borrowing capacity     $ 1,542,500,000.0       $ 1,542,500,000.0    
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | 2014 Credit Facilities [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 1.25%   1.00%            
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    
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, net of current maturities     $ 0       $ 0    
Basis spread on variable rate 2.25%   2.00%       2.00%    
Line of credit facility, maximum borrowing capacity     $ 300,000,000       $ 300,000,000    
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | April 2016 Credit Facilities [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 1.25%   1.00%            
American Airlines, Inc. [Member] | Secured Debt [Member] | Letter of Credit [Member] | 2013 Credit Facilities [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity     $ 100,000,000       100,000,000    
American Airlines, Inc. [Member] | Secured Debt [Member] | Letter of Credit [Member] | 2014 Credit Facilities [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity     $ 200,000,000       $ 200,000,000