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Employee Benefit Plans - Schedule of Fair Value of Pension Plan Assets by Asset Category (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 10,053 $ 11,395 $ 10,017
Pension Benefits [Member] | Private market partnerships [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 14 21
Pension Benefits [Member] | Insurance Group Annuity Contracts [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 2 2
Pension Benefits [Member] | Recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10,053 11,395  
Pension Benefits [Member] | Recurring [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6,027 7,281  
Pension Benefits [Member] | Recurring [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,602 2,936  
Pension Benefits [Member] | Recurring [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 9 16  
Pension Benefits [Member] | Recurring [Member] | Cash and cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 23 28  
Pension Benefits [Member] | Recurring [Member] | Cash and cash equivalents [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 23 28  
Pension Benefits [Member] | Recurring [Member] | Cash and cash equivalents [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Cash and cash equivalents [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | International markets [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,181 3,837  
Pension Benefits [Member] | Recurring [Member] | International markets [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,181 3,837  
Pension Benefits [Member] | Recurring [Member] | International markets [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | International markets [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Large-cap companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,021 2,451  
Pension Benefits [Member] | Recurring [Member] | Large-cap companies [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,021 2,451  
Pension Benefits [Member] | Recurring [Member] | Large-cap companies [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Large-cap companies [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Mid-cap companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 583 744  
Pension Benefits [Member] | Recurring [Member] | Mid-cap companies [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 583 744  
Pension Benefits [Member] | Recurring [Member] | Mid-cap companies [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Mid-cap companies [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Small-cap companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 122 125  
Pension Benefits [Member] | Recurring [Member] | Small-cap companies [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 122 125  
Pension Benefits [Member] | Recurring [Member] | Small-cap companies [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Small-cap companies [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 52 55  
Pension Benefits [Member] | Recurring [Member] | Mutual Funds [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 52 55  
Pension Benefits [Member] | Recurring [Member] | Mutual Funds [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Mutual Funds [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Corporate debt [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,116 2,344  
Pension Benefits [Member] | Recurring [Member] | Corporate debt [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Corporate debt [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,116 2,344  
Pension Benefits [Member] | Recurring [Member] | Corporate debt [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Government Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 228 238  
Pension Benefits [Member] | Recurring [Member] | Government Securities [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Government Securities [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 228 238  
Pension Benefits [Member] | Recurring [Member] | Government Securities [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | U.S. municipal securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 40 39  
Pension Benefits [Member] | Recurring [Member] | U.S. municipal securities [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | U.S. municipal securities [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 40 39  
Pension Benefits [Member] | Recurring [Member] | U.S. municipal securities [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 14  
Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 14  
Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member] | Fair Value Measured at Net Asset Value Per Share [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,188 879  
Pension Benefits [Member] | Recurring [Member] | Common/collective trusts [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 218 315  
Pension Benefits [Member] | Recurring [Member] | Common/collective trusts [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Common/collective trusts [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 218 315  
Pension Benefits [Member] | Recurring [Member] | Common/collective trusts [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Common/collective trusts and 103-12 Investment Trust measured at net asset value [Member] | Fair Value Measured at Net Asset Value Per Share [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 227 283  
Pension Benefits [Member] | Recurring [Member] | Insurance Group Annuity Contracts [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 2  
Pension Benefits [Member] | Recurring [Member] | Insurance Group Annuity Contracts [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Insurance Group Annuity Contracts [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Insurance Group Annuity Contracts [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 2  
Pension Benefits [Member] | Recurring [Member] | Dividend and interest receivable [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 47 44  
Pension Benefits [Member] | Recurring [Member] | Dividend and interest receivable [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 47 44  
Pension Benefits [Member] | Recurring [Member] | Dividend and interest receivable [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Dividend and interest receivable [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Due to/from brokers for sale of securities - net [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5 3  
Pension Benefits [Member] | Recurring [Member] | Due to/from brokers for sale of securities - net [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5 3  
Pension Benefits [Member] | Recurring [Member] | Due to/from brokers for sale of securities - net [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Due to/from brokers for sale of securities - net [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Other liabilities - net [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets (7) (6)  
Pension Benefits [Member] | Recurring [Member] | Other liabilities - net [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets (7) (6)  
Pension Benefits [Member] | Recurring [Member] | Other liabilities - net [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits [Member] | Recurring [Member] | Other liabilities - net [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Private market partnerships [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 14 21
American Airlines, Inc. [Member] | Insurance Group Annuity Contracts [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 2 2
American Airlines, Inc. [Member] | Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10,001 11,340 $ 9,968
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10,001 11,340  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5,975 7,226  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,602 2,936  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 9 16  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Cash and cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 23 28  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Cash and cash equivalents [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 23 28  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Cash and cash equivalents [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Cash and cash equivalents [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | International markets [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,181 3,837  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | International markets [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,181 3,837  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | International markets [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | International markets [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Large-cap companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,021 2,451  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Large-cap companies [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,021 2,451  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Large-cap companies [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Large-cap companies [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Mid-cap companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 583 744  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Mid-cap companies [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 583 744  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Mid-cap companies [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Mid-cap companies [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Small-cap companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 122 125  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Small-cap companies [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 122 125  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Small-cap companies [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Small-cap companies [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Corporate debt [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,116 2,344  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Corporate debt [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Corporate debt [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,116 2,344  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Corporate debt [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Government Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 228 238  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Government Securities [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Government Securities [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 228 238  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Government Securities [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | U.S. municipal securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 40 39  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | U.S. municipal securities [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | U.S. municipal securities [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 40 39  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | U.S. municipal securities [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 14  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 14  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member] | Fair Value Measured at Net Asset Value Per Share [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,188 879  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Common/collective trusts [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 218 315  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Common/collective trusts [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Common/collective trusts [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 218 315  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Common/collective trusts [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Common/collective trusts and 103-12 Investment Trust measured at net asset value [Member] | Fair Value Measured at Net Asset Value Per Share [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 227 283  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Insurance Group Annuity Contracts [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 2  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Insurance Group Annuity Contracts [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Insurance Group Annuity Contracts [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Insurance Group Annuity Contracts [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 2  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Dividend and interest receivable [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 47 44  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Dividend and interest receivable [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 47 44  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Dividend and interest receivable [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Dividend and interest receivable [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Due to/from brokers for sale of securities - net [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5 3  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Due to/from brokers for sale of securities - net [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5 3  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Due to/from brokers for sale of securities - net [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Due to/from brokers for sale of securities - net [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Other liabilities - net [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets (7) (6)  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Other liabilities - net [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets (7) (6)  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Other liabilities - net [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Other liabilities - net [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0 $ 0