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Debt - Components of Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2019
May 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Total long-term debt $ 23,856   $ 24,001
Less: Total unamortized debt discount, premium and issuance costs 211   222
Less: Current maturities 2,749   3,213
Long-term debt, net of current maturities 20,896   20,566
Secured Debt [Member]      
Debt Instrument [Line Items]      
Total long-term debt 22,606   22,751
Secured Debt [Member] | 2013 Credit Facilities [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 1,807   1,825
Variable interest rate 3.54%    
Secured Debt [Member] | 2014 Credit Facilities [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 1,202   1,215
Variable interest rate 3.72%    
Secured Debt [Member] | April 2016 Credit Facilities [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 970   980
Variable interest rate 3.80%    
Secured Debt [Member] | December 2016 Credit Facilities [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 1,213   1,225
Variable interest rate 3.74%    
Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 11,933   11,648
Average interest rate 4.05%    
Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Fixed interest rate per annum 3.00%    
Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Fixed interest rate per annum 8.39%    
Secured Debt [Member] | Equipment Loans and Other Notes Payable [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 4,727   5,060
Average interest rate 3.45%    
Secured Debt [Member] | Equipment Loans and Other Notes Payable [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Fixed interest rate per annum 2.99%    
Secured Debt [Member] | Equipment Loans and Other Notes Payable [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Fixed interest rate per annum 7.31%    
Secured Debt [Member] | Special Facility Revenue Bonds [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 754   798
Secured Debt [Member] | Special Facility Revenue Bonds [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Fixed interest rate per annum 5.00%    
Secured Debt [Member] | Special Facility Revenue Bonds [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Fixed interest rate per annum 8.00%    
Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 1,250   1,250
Unsecured Debt [Member] | Senior Notes 4.625% Due in 2020 [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 500   500
Fixed interest rate per annum 4.625%    
Unsecured Debt [Member] | Senior Notes 5.000% Due 2022 [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 750   0
Fixed interest rate per annum 5.00% 5.00%  
Unsecured Debt [Member] | 5.50% Senior Notes [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 0   750
Fixed interest rate per annum 5.50%    
American Airlines, Inc. [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 22,577    
Less: Total unamortized debt discount, premium and issuance costs 205   219
Less: Current maturities 2,246   2,466
Long-term debt, net of current maturities 20,126   20,037
American Airlines, Inc. [Member] | Secured Debt [Member]      
Debt Instrument [Line Items]      
Total long-term debt 22,577   22,722
American Airlines, Inc. [Member] | Secured Debt [Member] | 2013 Credit Facilities [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 1,807   1,825
Variable interest rate 3.54%    
American Airlines, Inc. [Member] | Secured Debt [Member] | 2014 Credit Facilities [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 1,202   1,215
Variable interest rate 3.72%    
American Airlines, Inc. [Member] | Secured Debt [Member] | April 2016 Credit Facilities [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 970   980
Variable interest rate 3.80%    
American Airlines, Inc. [Member] | Secured Debt [Member] | December 2016 Credit Facilities [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 1,213   1,225
Variable interest rate 3.74%    
American Airlines, Inc. [Member] | Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 11,933   11,648
Average interest rate 4.05%    
American Airlines, Inc. [Member] | Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Fixed interest rate per annum 3.00%    
American Airlines, Inc. [Member] | Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Fixed interest rate per annum 8.39%    
American Airlines, Inc. [Member] | Secured Debt [Member] | Equipment Loans and Other Notes Payable [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 4,727   5,060
Average interest rate 3.45%    
American Airlines, Inc. [Member] | Secured Debt [Member] | Equipment Loans and Other Notes Payable [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Fixed interest rate per annum 2.99%    
American Airlines, Inc. [Member] | Secured Debt [Member] | Equipment Loans and Other Notes Payable [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Fixed interest rate per annum 7.31%    
American Airlines, Inc. [Member] | Secured Debt [Member] | Special Facility Revenue Bonds [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 725   $ 769
Fixed interest rate per annum 5.00%