Debt - Narrative (Details)							1 Months Ended			6 Months Ended		9 Months Ended
	Jul. 20, 2026 USD ($)	Jul. 31, 2023 USD ($)	Jul. 20, 2023 USD ($)	Apr. 23, 2021	Mar. 24, 2021 USD ($)	Jan. 15, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) day	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Apr. 30, 2021 USD ($)	Jan. 31, 2021 ft²	Dec. 31, 2020 USD ($)	Oct. 21, 2020 USD ($)	Sep. 25, 2020 USD ($)	Jan. 31, 2020 USD ($)
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							$ 3,313,000,000			$ 3,313,000,000
Total long-term debt							39,917,000,000			39,917,000,000					$ 32,770,000,000
Proceeds from issuance of long-term debt										12,096,000,000	$ 9,464,000,000
Costs of issuance										166,000,000	$ 84,000,000
JFK Airport upgrade
Debt Instrument [Line Items]
Construction project, expected cost																		$ 439,000,000
New Terminal Building
Debt Instrument [Line Items]
Area of terminal building | ft²														51,000
Existing Terminal Building
Debt Instrument [Line Items]
Area of terminal building | ft²														73,300
Payroll Support Program Promissory Note Two, CARES Act
Debt Instrument [Line Items]
Debt instrument, face amount						$ 1,000,000,000.0		$ 1,000,000,000.0					$ 1,000,000,000.0
Prepayment term, number of days of the occurrence of triggering event						30 days
Payroll Support Program Promissory Note Three, CARES Act
Debt Instrument [Line Items]
Debt instrument, face amount							946,000,000			946,000,000
Prepayment term, number of days of the occurrence of triggering event				30 days
Increase in debt instrument face amount for each disbursement received				30.00%
2020 JFK Bonds | JFK Airport upgrade
Debt Instrument [Line Items]
Expected cost, funded by special facility revenue bond									$ 298,000,000
2021 JFK Bonds | JFK Airport upgrade
Debt Instrument [Line Items]
Expected cost, funded by special facility revenue bond										84,000,000
Secured Debt
Debt Instrument [Line Items]
Total long-term debt							33,921,000,000			33,921,000,000					28,755,000,000
Secured Debt | 2013 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							$ 1,770,000,000			$ 1,770,000,000					1,788,000,000
Variable interest rate							1.85%			1.85%
Secured Debt | 2014 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							$ 1,208,000,000			$ 1,208,000,000					1,220,000,000
Variable interest rate							1.85%			1.85%
Secured Debt | April 2016 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							$ 0			$ 0					450,000,000
Secured Debt | 5.50% Senior Notes
Debt Instrument [Line Items]
Stated interest rate							5.50%			5.50%
Total long-term debt							$ 3,500,000,000			$ 3,500,000,000					0
Secured Debt | 5.75% Senior Notes
Debt Instrument [Line Items]
Stated interest rate							5.75%			5.75%
Total long-term debt							$ 3,000,000,000			$ 3,000,000,000					0
Secured Debt | AAdvantage Term Loan Facility
Debt Instrument [Line Items]
Total long-term debt					$ 3,500,000,000		$ 3,500,000,000			$ 3,500,000,000					0
Debt redemption price percentage										100.00%
Variable interest rate							5.50%			5.50%
Mandatory prepayment trigger, net proceeds from pre-paid frequent flyer					500,000,000
Mandatory prepayment amount, threshold net proceeds from pre-paid frequent flyer					505,000,000
Covenant terms, threshold net proceeds from pre-paid frequent flyer					$ 550,000,000
Percentage of cash receipts saved in collection account (at least)					0.90
Covenant terms, minimum liquidity					$ 2,000,000,000.0
Secured Debt | AAdvantage Term Loan Facility | Minimum
Debt Instrument [Line Items]
Variable interest rate							0.75%			0.75%
Secured Debt | 2021 JFK Bonds
Debt Instrument [Line Items]
Debt instrument, face amount							$ 150,000,000			$ 150,000,000
Proceeds from issuance of long-term debt							150,000,000
Costs of issuance							4,000,000
Secured Debt | 2016 JFK Bonds and 2020 JFK Bonds
Debt Instrument [Line Items]
Repayments of long-term debt							$ 62,000,000
Secured Debt | 2021 JFK Bonds, 2.25% Matures 2026
Debt Instrument [Line Items]
Stated interest rate							2.25%			2.25%
Debt instrument, face amount							$ 70,000,000			$ 70,000,000
Secured Debt | 2021 JFK Bonds, 3.00% Matures 2031
Debt Instrument [Line Items]
Stated interest rate							3.00%			3.00%
Debt instrument, face amount							$ 80,000,000			$ 80,000,000
Secured Debt | LIBOR | AAdvantage Term Loan Facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate										4.75%
Senior Notes | 6.50% Senior Notes
Debt Instrument [Line Items]
Stated interest rate									6.50%		6.50%
If-converted value in excess of principal amount							309,000,000			$ 309,000,000
Convertible debt, threshold trading days | day										20
Convertible debt, threshold consecutive trading days | day										30
Conversion terms, percentage sales price exceeds conversion price									130.00%
Conversion ratio										0.0617284
Debt instrument, face amount							$ 1,000,000,000			$ 1,000,000,000
Senior Notes | 5.50% Senior Notes
Debt Instrument [Line Items]
Stated interest rate					5.50%		5.50%			5.50%
Debt instrument, face amount					$ 3,500,000,000		$ 3,500,000,000			$ 3,500,000,000
Senior Notes | 5.75% Senior Notes
Debt Instrument [Line Items]
Stated interest rate					5.75%		5.75%			5.75%
Debt instrument, face amount					$ 3,000,000,000.0		$ 3,000,000,000.0			$ 3,000,000,000.0
Senior Notes | Forecast | 5.50% Senior Notes
Debt Instrument [Line Items]
Quarterly installments			$ 292,000,000
Senior Notes | Forecast | 5.75% Senior Notes
Debt Instrument [Line Items]
Quarterly installments	$ 250,000,000
Senior Notes | Forecast | AAdvantage Term Loan Facility
Debt Instrument [Line Items]
Quarterly installments		$ 175,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							2,800,000,000			2,800,000,000
Revolving Credit Facility | 2013 Revolving Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							750,000,000			750,000,000
Debt instrument, face amount							0			0
Repayments of debt								750,000,000
Revolving Credit Facility | 2014 Revolving Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							1,643,000,000			1,643,000,000
Debt instrument, face amount							0			0
Repayments of debt								1,600,000,000
Revolving Credit Facility | April 2016 Revolving Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							450,000,000			450,000,000
Debt instrument, face amount							0			0
Repayments of debt								$ 450,000,000
Revolving Credit Facility | Secured Debt | 2013 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							0			0					750,000,000
Revolving Credit Facility | Secured Debt | 2014 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							0			0					1,643,000,000
Line of Credit | Treasury Loan Agreement, CARES Act
Debt Instrument [Line Items]
Repayments of debt					$ 550,000,000
Line of Credit | Secured Debt | Treasury Loan Agreement, CARES Act
Debt Instrument [Line Items]
Total long-term debt							0			0					550,000,000
Interest Rate First Five Years | Payroll Support Program Promissory Note Two, CARES Act
Debt Instrument [Line Items]
Stated interest rate						1.00%
Interest Rate First Five Years | Payroll Support Program Promissory Note Three, CARES Act
Debt Instrument [Line Items]
Stated interest rate				1.00%
Interest Rate Years Six Through Ten | Secured Overnight Financing Rate or Other | Payroll Support Program Promissory Note Two, CARES Act
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate						2.00%
Basis spread on variable rate, floor						0.00%
Interest Rate Years Six Through Ten | Secured Overnight Financing Rate or Other | Payroll Support Program Promissory Note Three, CARES Act
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				2.00%
Basis spread on variable rate, floor				0.00%
American Airlines, Inc.
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							3,313,000,000			3,313,000,000
Proceeds from issuance of long-term debt										10,115,000,000	$ 6,868,000,000
Costs of issuance										165,000,000	$ 75,000,000
American Airlines, Inc. | Secured Debt
Debt Instrument [Line Items]
Total long-term debt							33,921,000,000			33,921,000,000					28,731,000,000
American Airlines, Inc. | Secured Debt | 2013 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							$ 1,770,000,000			$ 1,770,000,000					1,788,000,000
Variable interest rate							1.85%			1.85%
American Airlines, Inc. | Secured Debt | 2014 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							$ 1,208,000,000			$ 1,208,000,000					1,220,000,000
Variable interest rate							1.85%			1.85%
American Airlines, Inc. | Secured Debt | April 2016 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							$ 0			$ 0					450,000,000
Line of credit facility, maximum borrowing capacity							$ 450,000,000			$ 450,000,000
American Airlines, Inc. | Secured Debt | 5.50% Senior Notes
Debt Instrument [Line Items]
Stated interest rate							5.50%			5.50%
Total long-term debt							$ 3,500,000,000			$ 3,500,000,000					0
American Airlines, Inc. | Secured Debt | 5.75% Senior Notes
Debt Instrument [Line Items]
Stated interest rate							5.75%			5.75%
Total long-term debt							$ 3,000,000,000			$ 3,000,000,000					0
American Airlines, Inc. | Secured Debt | AAdvantage Term Loan Facility
Debt Instrument [Line Items]
Total long-term debt							$ 3,500,000,000			$ 3,500,000,000					0
Variable interest rate							5.50%			5.50%
American Airlines, Inc. | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							$ 2,800,000,000			$ 2,800,000,000
American Airlines, Inc. | Revolving Credit Facility | Other Short-term Revolving Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							400,000,000			400,000,000
Line of credit facility, maximum borrowing capacity, with election of option to extend							500,000,000			500,000,000
American Airlines, Inc. | Revolving Credit Facility | Cargo Receivable Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							70,000,000			70,000,000
American Airlines, Inc. | Revolving Credit Facility | 2013 Revolving Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							750,000,000			750,000,000
American Airlines, Inc. | Revolving Credit Facility | 2014 Revolving Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							1,643,000,000			1,643,000,000
American Airlines, Inc. | Revolving Credit Facility | April 2016 Revolving Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							450,000,000			450,000,000
American Airlines, Inc. | Revolving Credit Facility | Secured Debt | 2013 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							0			0					750,000,000
Repayments of long-term debt										750,000,000
American Airlines, Inc. | Revolving Credit Facility | Secured Debt | 2014 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							0			0					1,643,000,000
Repayments of long-term debt										1,600,000,000
American Airlines, Inc. | Revolving Credit Facility | Secured Debt | April 2016 Revolving Facility
Debt Instrument [Line Items]
Repayments of long-term debt										450,000,000
American Airlines, Inc. | Line of Credit | Treasury Loan Agreement, CARES Act
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							7,500,000,000			7,500,000,000						$ 7,500,000,000	$ 5,500,000,000
Borrowings from credit facilities												$ 550,000,000
Repayments of long-term debt										550,000,000
American Airlines, Inc. | Line of Credit | Secured Debt | Treasury Loan Agreement, CARES Act
Debt Instrument [Line Items]
Total long-term debt							$ 0			$ 0					$ 550,000,000