Debt - Collateral-Related Covenants (Details)	12 Months Ended
	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Covenant terms, minimum aggregate liquidity required	$ 2,000,000,000.0
Secured Debt
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
American Airlines, Inc. | Secured Debt
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
American Airlines, Inc. | Secured Debt | 2013 Credit  Facilities
Debt Instrument [Line Items]
LTV as of Last Measurement Date	53.10%
American Airlines, Inc. | Secured Debt | 2014 Credit  Facilities
Debt Instrument [Line Items]
LTV as of Last Measurement Date	44.30%
American Airlines, Inc. | Secured Debt | April 2016 Credit Facilities
Debt Instrument [Line Items]
LTV as of Last Measurement Date	48.00%
American Airlines, Inc. | Secured Debt | December 2016 Credit Facilities
Debt Instrument [Line Items]
LTV as of Last Measurement Date	61.20%
American Airlines, Inc. | Secured Debt | 10.75% Senior Secured Notes
Debt Instrument [Line Items]
LTV as of Last Measurement Date	61.20%
American Airlines, Inc. | Secured Debt | 11.75% Senior Secured Notes
Debt Instrument [Line Items]
LTV as of Last Measurement Date	35.20%