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Employee Benefit Plans - Schedule of Fair Value of Pension Plan Assets by Asset Category (Details) - Pension Benefits - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 13,557 $ 12,897 $ 10,053
Private Market Partnerships | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 15 10 7
Insurance group annuity contracts | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 2 2
Recurring      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13,557 12,897  
Recurring | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5,039 5,858  
Recurring | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,326 4,140  
Recurring | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17 12  
Recurring | Cash and cash equivalents | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 40 20  
Recurring | Cash and cash equivalents | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 40 20  
Recurring | Cash and cash equivalents | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Cash and cash equivalents | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | International markets | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,282 2,769  
Recurring | International markets | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,282 2,769  
Recurring | International markets | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | International markets | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Large-cap companies | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,085 2,312  
Recurring | Large-cap companies | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,085 2,312  
Recurring | Large-cap companies | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Large-cap companies | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Mid-cap companies | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 428 543  
Recurring | Mid-cap companies | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 428 543  
Recurring | Mid-cap companies | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Mid-cap companies | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Small-cap companies | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 74 97  
Recurring | Small-cap companies | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 73 97  
Recurring | Small-cap companies | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 0  
Recurring | Small-cap companies | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Mutual Funds | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 80 68  
Recurring | Mutual Funds | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 80 68  
Recurring | Mutual Funds | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Mutual Funds | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Corporate obligations | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,026 2,804  
Recurring | Corporate obligations | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Corporate obligations | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,026 2,804  
Recurring | Corporate obligations | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Government Securities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,010 923  
Recurring | Government Securities | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Government Securities | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,010 923  
Recurring | Government Securities | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | U.S. municipal securities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 30 51  
Recurring | U.S. municipal securities | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | U.S. municipal securities | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 30 51  
Recurring | U.S. municipal securities | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Mortgage backed securities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   4  
Recurring | Mortgage backed securities | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Recurring | Mortgage backed securities | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   4  
Recurring | Mortgage backed securities | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Recurring | Private Market Partnerships | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 15 10  
Recurring | Private Market Partnerships | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Private Market Partnerships | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Private Market Partnerships | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 15 10  
Recurring | Private Market Partnerships | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,791 1,464  
Recurring | Common/collective trusts | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 259 358  
Recurring | Common/collective trusts | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Common/collective trusts | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 259 358  
Recurring | Common/collective trusts | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Common/collective trusts and 103-12 Investment Trust measured at net asset value | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,384 1,423  
Recurring | Insurance group annuity contracts | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 2  
Recurring | Insurance group annuity contracts | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Insurance group annuity contracts | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Insurance group annuity contracts | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 2  
Recurring | Dividend and interest receivable | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 49 53  
Recurring | Dividend and interest receivable | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 49 53  
Recurring | Dividend and interest receivable | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Dividend and interest receivable | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Due from brokers for sale of securities – net | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 (4)  
Recurring | Due from brokers for sale of securities – net | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 (4)  
Recurring | Due from brokers for sale of securities – net | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Due from brokers for sale of securities – net | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Recurring | Other receivables – net | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1    
Recurring | Other receivables – net | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1    
Recurring | Other receivables – net | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0    
Recurring | Other receivables – net | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0    
American Airlines, Inc.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13,477 12,829 10,001
American Airlines, Inc. | Private Market Partnerships | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 15 10 7
American Airlines, Inc. | Insurance group annuity contracts | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 2 $ 2
American Airlines, Inc. | Recurring      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13,477 12,829  
American Airlines, Inc. | Recurring | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,959 5,790  
American Airlines, Inc. | Recurring | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,326 4,140  
American Airlines, Inc. | Recurring | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17 12  
American Airlines, Inc. | Recurring | Cash and cash equivalents | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 40 20  
American Airlines, Inc. | Recurring | Cash and cash equivalents | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 40 20  
American Airlines, Inc. | Recurring | Cash and cash equivalents | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Cash and cash equivalents | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | International markets | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,282 2,769  
American Airlines, Inc. | Recurring | International markets | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,282 2,769  
American Airlines, Inc. | Recurring | International markets | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | International markets | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Large-cap companies | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,085 2,312  
American Airlines, Inc. | Recurring | Large-cap companies | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,085 2,312  
American Airlines, Inc. | Recurring | Large-cap companies | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Large-cap companies | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Mid-cap companies | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 428 543  
American Airlines, Inc. | Recurring | Mid-cap companies | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 428 543  
American Airlines, Inc. | Recurring | Mid-cap companies | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Mid-cap companies | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Small-cap companies | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 74 97  
American Airlines, Inc. | Recurring | Small-cap companies | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 73 97  
American Airlines, Inc. | Recurring | Small-cap companies | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 0  
American Airlines, Inc. | Recurring | Small-cap companies | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Corporate obligations | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,026 2,804  
American Airlines, Inc. | Recurring | Corporate obligations | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Corporate obligations | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,026 2,804  
American Airlines, Inc. | Recurring | Corporate obligations | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Government Securities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,010 923  
American Airlines, Inc. | Recurring | Government Securities | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Government Securities | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,010 923  
American Airlines, Inc. | Recurring | Government Securities | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | U.S. municipal securities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 30 51  
American Airlines, Inc. | Recurring | U.S. municipal securities | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | U.S. municipal securities | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 30 51  
American Airlines, Inc. | Recurring | U.S. municipal securities | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Mortgage backed securities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   4  
American Airlines, Inc. | Recurring | Mortgage backed securities | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
American Airlines, Inc. | Recurring | Mortgage backed securities | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   4  
American Airlines, Inc. | Recurring | Mortgage backed securities | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
American Airlines, Inc. | Recurring | Private Market Partnerships | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 15 10  
American Airlines, Inc. | Recurring | Private Market Partnerships | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Private Market Partnerships | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Private Market Partnerships | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 15 10  
American Airlines, Inc. | Recurring | Private Market Partnerships | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,791 1,464  
American Airlines, Inc. | Recurring | Common/collective trusts | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 259 358  
American Airlines, Inc. | Recurring | Common/collective trusts | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Common/collective trusts | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 259 358  
American Airlines, Inc. | Recurring | Common/collective trusts | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Common/collective trusts and 103-12 Investment Trust measured at net asset value | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,384 1,423  
American Airlines, Inc. | Recurring | Insurance group annuity contracts | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 2  
American Airlines, Inc. | Recurring | Insurance group annuity contracts | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Insurance group annuity contracts | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Insurance group annuity contracts | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 2  
American Airlines, Inc. | Recurring | Dividend and interest receivable | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 49 53  
American Airlines, Inc. | Recurring | Dividend and interest receivable | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 49 53  
American Airlines, Inc. | Recurring | Dividend and interest receivable | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Dividend and interest receivable | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Due from brokers for sale of securities – net | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 (4)  
American Airlines, Inc. | Recurring | Due from brokers for sale of securities – net | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 (4)  
American Airlines, Inc. | Recurring | Due from brokers for sale of securities – net | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. | Recurring | Due from brokers for sale of securities – net | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 $ 0  
American Airlines, Inc. | Recurring | Other receivables – net | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1    
American Airlines, Inc. | Recurring | Other receivables – net | Level 1          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1    
American Airlines, Inc. | Recurring | Other receivables – net | Level 2          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0    
American Airlines, Inc. | Recurring | Other receivables – net | Level 3          
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0