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Fair Value Measurements and Other Investments - Narrative (Details) - Level 3
$ in Millions
Sep. 30, 2020
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-term debt, classified as Level 3 $ 2,300
American Airlines, Inc.  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-term debt, classified as Level 3 $ 550