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Debt - Summary of Availability under Revolving Credit Facilities (Detail) - Revolving Credit Facility [Member] - Secured Debt [Member]
Mar. 31, 2018
USD ($)
Line of Credit Facility [Line Items]  
Line of credit facility, maximum borrowing capacity $ 2,500,000,000
2013 Credit Facilities [Member]  
Line of Credit Facility [Line Items]  
Line of credit facility, maximum borrowing capacity 1,200,000,000
2014 Credit Facilities [Member]  
Line of Credit Facility [Line Items]  
Line of credit facility, maximum borrowing capacity 1,000,000,000
April 2016 Credit Facilities [Member]  
Line of Credit Facility [Line Items]  
Line of credit facility, maximum borrowing capacity 300,000,000
American Airlines, Inc. [Member]  
Line of Credit Facility [Line Items]  
Line of credit facility, maximum borrowing capacity 2,500,000,000
American Airlines, Inc. [Member] | 2013 Credit Facilities [Member]  
Line of Credit Facility [Line Items]  
Line of credit facility, maximum borrowing capacity 1,200,000,000
American Airlines, Inc. [Member] | 2014 Credit Facilities [Member]  
Line of Credit Facility [Line Items]  
Line of credit facility, maximum borrowing capacity 1,000,000,000
American Airlines, Inc. [Member] | April 2016 Credit Facilities [Member]  
Line of Credit Facility [Line Items]  
Line of credit facility, maximum borrowing capacity $ 300,000,000