Employee Benefit Plans - Schedule of Allocation of Plan Assets (Details)	Dec. 31, 2018
Equity [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	60.00%
Equity [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	85.00%
U.S. Large [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	20.00%
U.S. Large [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	50.00%
U.S. Small/Mid [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
U.S. Small/Mid [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	10.00%
International [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	17.00%
International [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	27.00%
Emerging Markets [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	5.00%
Emerging Markets [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	11.00%
Alternative Investments [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	5.00%
Alternative Investments [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	20.00%
Fixed Income [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	15.00%
Fixed Income [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	40.00%
U.S. Long Duration [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	15.00%
U.S. Long Duration [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	30.00%
High Yield and Emerging Markets [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
High Yield and Emerging Markets [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	10.00%
Private Income [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
Private Income [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	10.00%
Cash Equivalents [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
Cash Equivalents [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	5.00%
American Airlines, Inc. [Member] | Equity [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	60.00%
American Airlines, Inc. [Member] | Equity [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	85.00%
American Airlines, Inc. [Member] | U.S. Large [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	20.00%
American Airlines, Inc. [Member] | U.S. Large [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	50.00%
American Airlines, Inc. [Member] | U.S. Small/Mid [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
American Airlines, Inc. [Member] | U.S. Small/Mid [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	10.00%
American Airlines, Inc. [Member] | International [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	17.00%
American Airlines, Inc. [Member] | International [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	27.00%
American Airlines, Inc. [Member] | Emerging Markets [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	5.00%
American Airlines, Inc. [Member] | Emerging Markets [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	11.00%
American Airlines, Inc. [Member] | Alternative Investments [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	5.00%
American Airlines, Inc. [Member] | Alternative Investments [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	20.00%
American Airlines, Inc. [Member] | Fixed Income [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	15.00%
American Airlines, Inc. [Member] | Fixed Income [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	40.00%
American Airlines, Inc. [Member] | U.S. Long Duration [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	15.00%
American Airlines, Inc. [Member] | U.S. Long Duration [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	30.00%
American Airlines, Inc. [Member] | High Yield and Emerging Markets [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
American Airlines, Inc. [Member] | High Yield and Emerging Markets [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	10.00%
American Airlines, Inc. [Member] | Private Income [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
American Airlines, Inc. [Member] | Private Income [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	10.00%
American Airlines, Inc. [Member] | Cash Equivalents [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
American Airlines, Inc. [Member] | Cash Equivalents [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	5.00%