Employee Benefit Plans - Schedule of Fair Value of Pension Plan Assets by Asset Category - Additional Information (Details) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
International markets, United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	14.00%	10.00%
International markets, United Kingdom | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	14.00%	10.00%
International markets, Ireland
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	10.00%	11.00%
International markets, Ireland | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	10.00%	11.00%
International markets, Japan
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	10.00%	8.00%
International markets, Japan | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	10.00%	8.00%
International markets, Switzerland
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	9.00%	11.00%
International markets, Switzerland | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	9.00%	11.00%
International markets, France
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	7.00%	9.00%
International markets, France | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	7.00%	9.00%
International markets, Germany
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	6.00%	7.00%
International markets, Germany | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	6.00%	7.00%
International markets, Netherlands
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations		6.00%
International markets, Netherlands | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations		6.00%
International markets, emerging markets
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	12.00%	13.00%
International markets, emerging markets | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	12.00%	13.00%
International markets, no concentration greater than 5% in any one country
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	32.00%	25.00%
International markets, no concentration greater than 5% in any one country | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	32.00%	25.00%
Mutual funds/exchange traded funds | U.S. Companies
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	13.00%	39.00%
Mutual funds/exchange traded funds | US Treasuries and Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	70.00%	35.00%
Mutual funds/exchange traded funds | US Treasuries and Corporate Bonds | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	86.00%
Mutual funds/exchange traded funds | International Companies
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	17.00%	26.00%
Mutual funds/exchange traded funds | International Companies | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	14.00%
Corporate obligations | U.S. Companies
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	86.00%	89.00%
Corporate obligations | U.S. Companies | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	86.00%	89.00%
Corporate obligations | International Companies
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	12.00%	9.00%
Corporate obligations | International Companies | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	12.00%	9.00%
Corporate obligations | Corporate Debt with A Standard and Poor's (S&P) Rating Lower than A
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	81.00%	77.00%
Corporate obligations | Corporate Debt with A Standard and Poor's (S&P) Rating Lower than A | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	81.00%	77.00%
Corporate obligations | Corporate Debt with Standard and Poor's (S&P) Rating A or Higher
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	19.00%	23.00%
Corporate obligations | Corporate Debt with Standard and Poor's (S&P) Rating A or Higher | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	19.00%	23.00%
Corporate obligations | Emerging Market Companies
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	2.00%	2.00%
Corporate obligations | Emerging Market Companies | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	2.00%	2.00%
Government securities | Domestic Government Securities
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	94.00%	89.00%
Government securities | Domestic Government Securities | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	94.00%	89.00%
Government securities | Emerging Market Government Securities
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	6.00%	9.00%
Government securities | Emerging Market Government Securities | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	6.00%	9.00%
Government securities | Other International Government Securities
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations		2.00%
Government securities | Other International Government Securities | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations		2.00%
Private Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan master trust future funding commitments	$ 1.6	$ 1.6
Private Equity Funds | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan master trust future funding commitments	$ 1.6	$ 1.6
Private Equity Funds | Minimum
Defined Benefit Plan Disclosure [Line Items]
Estimated period of liquidation of underlying assets	1 year	1 year
Private Equity Funds | Minimum | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Estimated period of liquidation of underlying assets	1 year	1 year
Private Equity Funds | Maximum
Defined Benefit Plan Disclosure [Line Items]
Estimated period of liquidation of underlying assets	10 years	10 years
Private Equity Funds | Maximum | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Estimated period of liquidation of underlying assets	10 years	10 years
Common/collective trusts and 103-12 Investment Trust measured at net asset value | Common or Collective Trust, Securities of Larger Companies within US
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	31.00%	34.00%
Common/collective trusts and 103-12 Investment Trust measured at net asset value | Common or Collective Trust, Securities of Larger Companies within US | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	31.00%	34.00%
Common/collective trusts and 103-12 Investment Trust measured at net asset value | Common or Collective Trust, Emerging Country
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	29.00%	30.00%
Common/collective trusts and 103-12 Investment Trust measured at net asset value | Common or Collective Trust, Emerging Country | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	29.00%	30.00%
Common/collective trusts and 103-12 Investment Trust measured at net asset value | Common or Collective Trust, Securities of Companies outside US
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	22.00%	21.00%
Common/collective trusts and 103-12 Investment Trust measured at net asset value | Common or Collective Trust, Securities of Companies outside US | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	22.00%	21.00%
Common/collective trusts and 103-12 Investment Trust measured at net asset value | Common or Collective Interest Trust, Short-term Securities
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	11.00%	9.00%
Common/collective trusts and 103-12 Investment Trust measured at net asset value | Common or Collective Interest Trust, Short-term Securities | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	11.00%	9.00%
Common/collective trusts and 103-12 Investment Trust measured at net asset value | Common or Collective Trust, Securities of Smaller Companies within US
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	6.00%	5.00%
Common/collective trusts and 103-12 Investment Trust measured at net asset value | Common or Collective Trust, Securities of Smaller Companies within US | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	6.00%	5.00%
Common/collective trusts and 103-12 Investment Trust measured at net asset value | Canadian Segregated Balanced Value
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	1.00%	1.00%
Common/collective trusts and 103-12 Investment Trust measured at net asset value | Canadian Segregated Balanced Value | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	1.00%	1.00%