Debt - Narrative (Details)						1 Months Ended	3 Months Ended	9 Months Ended
	Jul. 20, 2026 USD ($)	Jul. 31, 2023 USD ($)	Jul. 20, 2023 USD ($)	Mar. 24, 2021 USD ($)	Jan. 15, 2021 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Oct. 21, 2020 USD ($)	Sep. 25, 2020 USD ($)
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							$ 3,297,000,000
Total long-term debt							39,639,000,000		$ 32,770,000,000
Payroll Support Program Promissory Note Two, CARES Act
Debt Instrument [Line Items]
Debt instrument, face amount					$ 896,000,000		$ 896,000,000
Increase in debt instrument face amount for each disbursement received					30.00%
Prepayment term, number of days of the occurrence of triggering event							30 days
Secured Debt
Debt Instrument [Line Items]
Total long-term debt							$ 34,728,000,000		28,755,000,000
Secured Debt | 2013 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							$ 1,788,000,000		1,788,000,000
Variable interest rate							1.86%
Secured Debt | 2014 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							$ 1,208,000,000		1,220,000,000
Variable interest rate							1.86%
Secured Debt | April 2016 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							$ 960,000,000		960,000,000
Variable interest rate							2.11%
Secured Debt | 5.50% Senior Notes
Debt Instrument [Line Items]
Stated interest rate							5.50%
Total long-term debt							$ 3,500,000,000		0
Secured Debt | 5.75% Senior Notes
Debt Instrument [Line Items]
Stated interest rate							5.75%
Total long-term debt							$ 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		0
Debt redemption price percentage							100.00%
Variable interest rate							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%
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%
If-converted value in excess of principal amount						$ 475,000,000
Conversion terms, percentage sales price exceeds conversion price						130.00%
Conversion ratio						0.0617284
Debt instrument, face amount							$ 1,000,000,000
Senior Notes | 5.50% Senior Notes
Debt Instrument [Line Items]
Stated interest rate				5.50%			5.50%
Debt instrument, face amount				$ 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%
Debt instrument, face amount				$ 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
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		550,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							2,800,000,000
Revolving Credit Facility | 2013 Revolving Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							750,000,000
Repayments of debt							750,000,000
Debt instrument, face amount							0
Revolving Credit Facility | 2014 Revolving Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							1,643,000,000
Repayments of debt							1,600,000,000
Debt instrument, face amount							0
Revolving Credit Facility | April 2016 Revolving Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							450,000,000
Repayments of debt							450,000,000
Debt instrument, face amount							0
Revolving Credit Facility | Secured Debt | 2013 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							0		750,000,000
Revolving Credit Facility | Secured Debt | 2014 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							0		1,643,000,000
Revolving Credit Facility | Secured Debt | April 2016 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							0		450,000,000
Interest Rate First Five Years | Payroll Support Program Promissory Note Two, CARES Act
Debt Instrument [Line Items]
Stated interest rate					1.00%
Interest Rate 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%
American Airlines, Inc.
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							3,297,000,000
American Airlines, Inc. | Secured Debt
Debt Instrument [Line Items]
Total long-term debt							34,704,000,000		28,731,000,000
American Airlines, Inc. | Secured Debt | 2013 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							$ 1,788,000,000		1,788,000,000
Variable interest rate							1.86%
American Airlines, Inc. | Secured Debt | 2014 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							$ 1,208,000,000		1,220,000,000
Variable interest rate							1.86%
American Airlines, Inc. | Secured Debt | April 2016 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							$ 960,000,000		960,000,000
Variable interest rate							2.11%
American Airlines, Inc. | Secured Debt | 5.50% Senior Notes
Debt Instrument [Line Items]
Stated interest rate							5.50%
Total long-term debt							$ 3,500,000,000		0
American Airlines, Inc. | Secured Debt | 5.75% Senior Notes
Debt Instrument [Line Items]
Stated interest rate							5.75%
Total long-term debt							$ 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		0
Variable interest rate							5.50%
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	$ 5,500,000,000
Borrowings from credit facilities								$ 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		550,000,000
American Airlines, Inc. | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							2,800,000,000
American Airlines, Inc. | Revolving Credit Facility | 2013 Revolving Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							750,000,000
American Airlines, Inc. | Revolving Credit Facility | 2014 Revolving Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							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
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
Line of credit facility, maximum borrowing capacity, with election of option to extend							500,000,000
American Airlines, Inc. | Revolving Credit Facility | Cargo Receivable Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity							54,000,000
American Airlines, Inc. | Revolving Credit Facility | Secured Debt | 2013 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							0		750,000,000
American Airlines, Inc. | Revolving Credit Facility | Secured Debt | 2014 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							0		1,643,000,000
American Airlines, Inc. | Revolving Credit Facility | Secured Debt | April 2016 Revolving Facility
Debt Instrument [Line Items]
Total long-term debt							$ 0		$ 450,000,000