v3.26.3
Fair Value Measurements - Summary of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments $ 7,163 $ 4,882
Restricted cash and short-term investments 555  
Long-term investments 105  
Total 7,823  
American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 7,159 $ 4,880
Restricted cash and short-term investments 555  
Long-term investments 105  
Total 7,819  
Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 539  
Money market funds | American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 537  
Corporate obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 3,998  
Corporate obligations | American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 3,998  
Bank notes/certificates of deposit/time deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 2,276  
Bank notes/certificates of deposit/time deposits | American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 2,274  
Repurchase agreements    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 350  
Repurchase agreements | American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 350  
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 539  
Restricted cash and short-term investments 377  
Long-term investments 105  
Total 1,021  
Level 1 | American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 537  
Restricted cash and short-term investments 377  
Long-term investments 105  
Total 1,019  
Level 1 | Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 539  
Level 1 | Money market funds | American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 537  
Level 1 | Corporate obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0  
Level 1 | Corporate obligations | American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0  
Level 1 | Bank notes/certificates of deposit/time deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0  
Level 1 | Bank notes/certificates of deposit/time deposits | American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0  
Level 1 | Repurchase agreements    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0  
Level 1 | Repurchase agreements | American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0  
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 6,624  
Restricted cash and short-term investments 178  
Long-term investments 0  
Total 6,802  
Level 2 | American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 6,622  
Restricted cash and short-term investments 178  
Long-term investments 0  
Total 6,800  
Level 2 | Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0  
Level 2 | Money market funds | American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0  
Level 2 | Corporate obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 3,998  
Level 2 | Corporate obligations | American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 3,998  
Level 2 | Bank notes/certificates of deposit/time deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 2,276  
Level 2 | Bank notes/certificates of deposit/time deposits | American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 2,274  
Level 2 | Repurchase agreements    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 350  
Level 2 | Repurchase agreements | American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 350  
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0  
Restricted cash and short-term investments 0  
Long-term investments 0  
Total 0  
Level 3 | American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0  
Restricted cash and short-term investments 0  
Long-term investments 0  
Total 0  
Level 3 | Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0  
Level 3 | Money market funds | American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0  
Level 3 | Corporate obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0  
Level 3 | Corporate obligations | American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0  
Level 3 | Bank notes/certificates of deposit/time deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0  
Level 3 | Bank notes/certificates of deposit/time deposits | American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0  
Level 3 | Repurchase agreements    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0  
Level 3 | Repurchase agreements | American Airlines, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments $ 0