Commitments, Contingencies and Guarantees - Additional Information (Details) shares in Millions		1 Months Ended		12 Months Ended
	Jun. 15, 2018 USD ($)	Feb. 29, 2020 shares	Jun. 30, 2015 lawsuit	Dec. 31, 2020 USD ($) employee aircraft engine shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) lane
Long-term Purchase Commitment [Line Items]
Airport redevelopment, number of security screening lanes | lane						10
Number of aircraft owned through financing under EETCs | aircraft				350
Number of aircraft leased through financing under EETCs | aircraft				24
Number of spare aircraft engines owned through financing under EETCs | engine				62
Long-term debt				$ 32,770,000,000	$ 23,856,000,000
Operating lease liabilities				8,428,000,000	9,129,000,000
Letters of credit outstanding and surety bonds, amount				$ 476,000,000
Capital shares distributed from disputed claims reserve | shares		2.2
Shares reserved for issuance in Disputed Claims Reserve (in shares) | shares				4.8
Number of putative class action lawsuits | lawsuit			100
Settlement amount	$ 45,000,000
Number of full-time equivalent employees | employee				102,700
Percentage of employees covered by collective bargaining agreements with various labor unions				84.00%
Percentage of employees covered by collective bargaining agreements that are currently available				0.43
Restricted Cash
Long-term Purchase Commitment [Line Items]
Letters of credit outstanding and surety bonds, amount				$ 110,000,000
Leasehold Improvements | LAX Modernization Project
Long-term Purchase Commitment [Line Items]
Airport development, amount						$ 1,600,000,000
Airport redevelopment, costs incurred and capitalized				223,000,000
Airport redevelopment cost incurred in current year				114,000,000
Non-proprietary improvements sold and transferred				$ 111,000,000
Regional Carrier
Long-term Purchase Commitment [Line Items]
Number of full-time equivalent employees | employee				24,400
EETC Leveraged Lease Financings
Long-term Purchase Commitment [Line Items]
Operating lease liabilities				$ 78,000,000
Special Facility Revenue Bonds
Long-term Purchase Commitment [Line Items]
Operating lease liabilities				321,000,000
Guarantor obligations, maximum exposure, undiscounted				572,000,000
Secured Debt
Long-term Purchase Commitment [Line Items]
Long-term debt				28,755,000,000	22,606,000,000
Unsecured Debt
Long-term Purchase Commitment [Line Items]
Long-term debt				4,015,000,000	1,250,000,000
Enhanced Equipment Trust Certificates (EETC) | Secured Debt
Long-term Purchase Commitment [Line Items]
Long-term debt				11,013,000,000	11,933,000,000
Special Facility Revenue Bonds | Secured Debt
Long-term Purchase Commitment [Line Items]
Long-term debt				1,064,000,000	754,000,000
Guarantor obligations, maximum exposure, undiscounted				1,000,000,000.0
Credit Facilities and Certain EETC Financings | Secured Debt
Long-term Purchase Commitment [Line Items]
Guarantor obligations, maximum exposure, undiscounted				15,000,000,000.0
PSP1, CAREs Act | Unsecured Debt
Long-term Purchase Commitment [Line Items]
Long-term debt				1,765,000,000	0
Senior Notes 5.000% Due 2022 | Unsecured Debt
Long-term Purchase Commitment [Line Items]
Long-term debt				$ 750,000,000	750,000,000
Fixed interest rate per annum				5.00%
Senior Notes 3.75% Matures 2025 | Unsecured Debt
Long-term Purchase Commitment [Line Items]
Long-term debt				$ 500,000,000	0
Fixed interest rate per annum				3.75%
Senior Notes 6.50% Due 2025 | Unsecured Debt
Long-term Purchase Commitment [Line Items]
Long-term debt				$ 1,000,000,000	0
Fixed interest rate per annum				6.50%
American Airlines, Inc.
Long-term Purchase Commitment [Line Items]
Airport redevelopment, number of security screening lanes | lane						10
Number of aircraft owned through financing under EETCs | aircraft				350
Number of aircraft leased through financing under EETCs | aircraft				24
Number of spare aircraft engines owned through financing under EETCs | engine				62
Long-term debt				$ 28,731,000,000
Operating lease liabilities				8,380,000,000	9,083,000,000
Letters of credit outstanding and surety bonds, amount				$ 476,000,000
Capital shares distributed from disputed claims reserve | shares		2.2
Number of putative class action lawsuits | lawsuit			100
Settlement amount	$ 45,000,000
Number of full-time equivalent employees | employee				78,300
Percentage of employees covered by collective bargaining agreements with various labor unions				84.00%
American Airlines, Inc. | Leasehold Improvements | LAX Modernization Project
Long-term Purchase Commitment [Line Items]
Airport development, amount						$ 1,600,000,000
Airport redevelopment, costs incurred and capitalized				$ 223,000,000
Airport redevelopment cost incurred in current year				114,000,000
Non-proprietary improvements sold and transferred				111,000,000
American Airlines, Inc. | EETC Leveraged Lease Financings
Long-term Purchase Commitment [Line Items]
Operating lease liabilities				78,000,000
American Airlines, Inc. | Special Facility Revenue Bonds
Long-term Purchase Commitment [Line Items]
Guarantor obligations, maximum exposure, undiscounted				572,000,000
American Airlines, Inc. | Secured Debt
Long-term Purchase Commitment [Line Items]
Long-term debt				28,731,000,000	22,577,000,000
American Airlines, Inc. | Enhanced Equipment Trust Certificates (EETC) | Secured Debt
Long-term Purchase Commitment [Line Items]
Long-term debt				11,013,000,000	11,933,000,000
American Airlines, Inc. | Special Facility Revenue Bonds | Secured Debt
Long-term Purchase Commitment [Line Items]
Long-term debt				1,040,000,000	$ 725,000,000
American Airlines, Inc. | PSP1, CAREs Act | Unsecured Debt
Long-term Purchase Commitment [Line Items]
Guarantor obligations, maximum exposure, undiscounted				1,800,000,000
American Airlines, Inc. | Senior Notes 5.000% Due 2022 | Unsecured Debt
Long-term Purchase Commitment [Line Items]
Guarantor obligations, maximum exposure, undiscounted				750,000,000
American Airlines, Inc. | Senior Notes 3.75% Matures 2025 | Unsecured Debt
Long-term Purchase Commitment [Line Items]
Guarantor obligations, maximum exposure, undiscounted				$ 500,000,000
Fixed interest rate per annum				3.75%
American Airlines, Inc. | Senior Notes 6.50% Due 2025 | Unsecured Debt
Long-term Purchase Commitment [Line Items]
Guarantor obligations, maximum exposure, undiscounted				$ 1,000,000,000.0
Fixed interest rate per annum				6.50%