Commitments, Contingencies and Guarantees - Additional Information (Details) shares in Millions			1 Months Ended	12 Months Ended
	Feb. 12, 2019 shares	Jun. 15, 2018 USD ($)	Jun. 30, 2015 lawsuit	Dec. 31, 2018 USD ($) Employees Aircraft security_screening_lane	Dec. 31, 2017 USD ($)
Long-term Purchase Commitment [Line Items]
Airport development, amount				$ 1,600,000,000
Airport redevelopment, number of security screening lanes | security_screening_lane				16
Airport redevelopment, costs incurred and capitalized				$ 7,000,000
Number of aircraft owned through financing under EETC | Aircraft				389
Number of aircraft operating leased under trusts | Aircraft				88
Long-term debt				$ 24,001,000,000	$ 24,530,000,000
Operating lease liabilities				9,556,000,000
Letters of credit outstanding and surety bonds, amount				$ 460,000,000
Number of putative class action lawsuits | lawsuit			100
Settlement amount		$ 45,000,000
Number of full-time equivalent employees | Employees				128,900
Percentage of employees covered by collective bargaining agreements with various labor unions				84.00%
Percentage of employees covered by collective bargaining agreements that will become amendable within one year				22.00%
Regional Carrier [Member]
Long-term Purchase Commitment [Line Items]
Number of full-time equivalent employees | Employees				26,000
Subsequent Event [Member]
Long-term Purchase Commitment [Line Items]
Shares distributed from Disputed Claims Reserve | shares	17.3
Shares reserved for issuance in Disputed Claims Reserve | shares	7.2
EETC Leveraged Lease Financings [Member]
Long-term Purchase Commitment [Line Items]
Operating lease liabilities				$ 352,000,000
Special Facility Revenue Bonds [Member]
Long-term Purchase Commitment [Line Items]
Operating lease liabilities				321,000,000
Guarantor obligations, maximum exposure, undiscounted				588,000,000
Secured Debt [Member]
Long-term Purchase Commitment [Line Items]
Long-term debt				22,751,000,000	22,780,000,000
Unsecured Debt [Member]
Long-term Purchase Commitment [Line Items]
Long-term debt				1,250,000,000	1,750,000,000
Enhanced Equipment Trust Certificates (EETC) [Member] | Secured Debt [Member]
Long-term Purchase Commitment [Line Items]
Long-term debt				11,648,000,000	11,881,000,000
Special Facility Revenue Bonds [Member] | Secured Debt [Member]
Long-term Purchase Commitment [Line Items]
Long-term debt				798,000,000	857,000,000
Guarantor obligations, maximum exposure, undiscounted				769,000,000
Credit Facilities And Certain EETC Financings [Member] | Secured Debt [Member]
Long-term Purchase Commitment [Line Items]
Guarantor obligations, maximum exposure, undiscounted				8,400,000,000
Senior Notes 5.50% Due in 2019 [Member] | Unsecured Debt [Member]
Long-term Purchase Commitment [Line Items]
Long-term debt				$ 750,000,000	750,000,000
Fixed interest rate				5.50%
Senior Notes 4.625% Due in 2020 [Member] | Unsecured Debt [Member]
Long-term Purchase Commitment [Line Items]
Long-term debt				$ 500,000,000	500,000,000
Fixed interest rate				4.625%
American Airlines, Inc. [Member]
Long-term Purchase Commitment [Line Items]
Airport development, amount				$ 1,600,000,000
Airport redevelopment, number of security screening lanes | security_screening_lane				16
Airport redevelopment, costs incurred and capitalized				$ 7,000,000
Number of aircraft owned through financing under EETC | Aircraft				389
Number of aircraft operating leased under trusts | Aircraft				88
Long-term debt				$ 22,722,000,000
Operating lease liabilities				$ 9,496,000,000
Number of putative class action lawsuits | lawsuit			100
Settlement amount		$ 45,000,000
Number of full-time equivalent employees | Employees				102,900
Percentage of employees covered by collective bargaining agreements with various labor unions				84.00%
Percentage of employees covered by collective bargaining agreements that will become amendable within one year				24.00%
American Airlines, Inc. [Member] | EETC Leveraged Lease Financings [Member]
Long-term Purchase Commitment [Line Items]
Operating lease liabilities				$ 352,000,000
American Airlines, Inc. [Member] | Special Facility Revenue Bonds [Member]
Long-term Purchase Commitment [Line Items]
Operating lease liabilities				321,000,000
American Airlines, Inc. [Member] | Secured Debt [Member]
Long-term Purchase Commitment [Line Items]
Long-term debt				22,722,000,000	22,750,000,000
American Airlines, Inc. [Member] | Enhanced Equipment Trust Certificates (EETC) [Member] | Secured Debt [Member]
Long-term Purchase Commitment [Line Items]
Long-term debt				11,648,000,000	11,881,000,000
American Airlines, Inc. [Member] | Special Facility Revenue Bonds [Member] | Secured Debt [Member]
Long-term Purchase Commitment [Line Items]
Long-term debt				769,000,000	$ 828,000,000
American Airlines, Inc. [Member] | Senior Notes 5.50% Due in 2019 [Member] | Unsecured Debt [Member]
Long-term Purchase Commitment [Line Items]
Guarantor obligations, maximum exposure, undiscounted				750,000,000
American Airlines, Inc. [Member] | Senior Notes 4.625% Due in 2020 [Member] | Unsecured Debt [Member]
Long-term Purchase Commitment [Line Items]
Guarantor obligations, maximum exposure, undiscounted				$ 500,000,000