Basis of Presentation and Recent Accounting Pronouncements (Details)		1 Months Ended	3 Months Ended
	Jan. 15, 2021 USD ($) $ / shares shares	Jan. 31, 2021 USD ($)	Mar. 31, 2021 USD ($) member $ / shares shares	Mar. 24, 2021 USD ($)	Jan. 01, 2021 USD ($)	Dec. 31, 2020 USD ($)	Oct. 21, 2020 USD ($)	Sep. 25, 2020 USD ($)	Jun. 30, 2020
Unusual or Infrequent Item, or Both [Line Items]
Decrease in flying compared to prior year period (in percentage)			39.20%
Decrease in domestic capacity in percentage			36.80%
Decrease in international capacity in percentage			45.10%
Number of team members opting for early retirement or long-term paid leave (more than) | member			1,600
Available liquidity			$ 17,300,000,000
Unrestricted cash and short-term investments			14,000,000,000.0
Line of credit facility, remaining borrowing capacity			$ 3,297,000,000
Issuance of shares of AAG common stock pursuant to a public stock offering (in shares) | shares			18,194,573
Minimum liquidity			$ 2,000,000,000.0
Retained deficit			$ (7,895,000,000)			$ (6,664,000,000)
At-The-Market Offering
Unusual or Infrequent Item, or Both [Line Items]
Issuance of shares of AAG common stock pursuant to a public stock offering (in shares) | shares			18,200,000
Price per share (in dollars per share) | $ / shares			$ 17.59
Proceeds from issuance of common stock			$ 316,000,000
US Department of the Treasury, CARES Act, Payroll Support Program Two
Unusual or Infrequent Item, or Both [Line Items]
Financial assistance received under the CARES Act	$ 3,100,000,000	$ 3,100,000,000
Payroll Support Program Promissory Note Two, CARES Act
Unusual or Infrequent Item, or Both [Line Items]
Debt instrument, face amount	$ 896,000,000		$ 896,000,000
Warrants, number of warrant shares of common stock | shares	5,700,000		5,700,000
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
Exercise price of warrants (in dollars per share) | $ / shares	$ 15.66
Additional warrants, percentage of borrowing	0.10
Payroll Support Program Promissory Note Two, CARES Act | Interest Rate First Five Years
Unusual or Infrequent Item, or Both [Line Items]
Stated interest rate	1.00%
Payroll Support Program Promissory Note Two, CARES Act | Interest Rate Years Six Through Ten | Secured Overnight Financing Rate or Other
Unusual or Infrequent Item, or Both [Line Items]
Debt instrument, basis spread on variable rate	2.00%
Basis spread on variable rate, floor	0.00%
PSP2 Warrants
Unusual or Infrequent Item, or Both [Line Items]
Debt instrument, face amount	$ 65,000,000
Other PSP2 Financial Assistance, CARES Act
Unusual or Infrequent Item, or Both [Line Items]
Debt instrument, face amount	2,100,000,000
Financial assistance received under the CARES Act	$ 2,100,000,000
Senior Notes | 5.50% Senior Notes
Unusual or Infrequent Item, or Both [Line Items]
Debt instrument, face amount			$ 3,500,000,000	$ 3,500,000,000
Stated interest rate			5.50%	5.50%
Senior Notes | 5.75% Senior Notes
Unusual or Infrequent Item, or Both [Line Items]
Debt instrument, face amount			$ 3,000,000,000.0	$ 3,000,000,000.0
Stated interest rate			5.75%	5.75%
Senior Notes | Term Loan Facility
Unusual or Infrequent Item, or Both [Line Items]
Debt instrument, face amount			$ 3,500,000,000
Senior Notes | 6.50% Senior Notes
Unusual or Infrequent Item, or Both [Line Items]
Debt instrument, face amount			1,000,000,000
Stated interest rate									6.50%
Senior Notes | 6.50% Senior Notes | Cumulative Effect, Period of Adoption, Adjustment
Unusual or Infrequent Item, or Both [Line Items]
Equity component of convertible debt issued, net of tax and offering costs			415,000,000
Reduction of additional paid in capital, equity component of convertible debt, net of tax and offering costs			$ 320,000,000
Retained deficit					$ 19,000,000
Reduction of unamortized discount					$ 389,000,000
Secured Debt | 5.50% Senior Notes
Unusual or Infrequent Item, or Both [Line Items]
Stated interest rate			5.50%
Secured Debt | 5.75% Senior Notes
Unusual or Infrequent Item, or Both [Line Items]
Stated interest rate			5.75%
Revolving Credit Facility
Unusual or Infrequent Item, or Both [Line Items]
Line of credit facility, remaining borrowing capacity			$ 2,800,000,000
Revolving Credit Facility | Short-term Revolving and Other Facilities
Unusual or Infrequent Item, or Both [Line Items]
Line of credit facility, remaining borrowing capacity			454,000,000
Revolving Credit Facility | 2013 Revolving Facility
Unusual or Infrequent Item, or Both [Line Items]
Line of credit facility, remaining borrowing capacity			750,000,000
Debt instrument, face amount			0
Revolving Credit Facility | 2014 Revolving Facility
Unusual or Infrequent Item, or Both [Line Items]
Line of credit facility, remaining borrowing capacity			1,643,000,000
Debt instrument, face amount			0
Revolving Credit Facility | April 2016 Revolving Facility
Unusual or Infrequent Item, or Both [Line Items]
Line of credit facility, remaining borrowing capacity			450,000,000
Debt instrument, face amount			0
American Airlines, Inc.
Unusual or Infrequent Item, or Both [Line Items]
Available liquidity			17,300,000,000
Unrestricted cash and short-term investments			14,000,000,000.0
Line of credit facility, remaining borrowing capacity			3,297,000,000
Retained deficit			$ (6,723,000,000)			$ (5,508,000,000)
American Airlines, Inc. | Secured Debt | 5.50% Senior Notes
Unusual or Infrequent Item, or Both [Line Items]
Stated interest rate			5.50%
American Airlines, Inc. | Secured Debt | 5.75% Senior Notes
Unusual or Infrequent Item, or Both [Line Items]
Stated interest rate			5.75%
American Airlines, Inc. | Secured Debt | Equipment Loans and Other Notes Payable
Unusual or Infrequent Item, or Both [Line Items]
Proceeds from sale-leaseback transactions			$ 99,000,000
American Airlines, Inc. | Revolving Credit Facility
Unusual or Infrequent Item, or Both [Line Items]
Line of credit facility, remaining borrowing capacity			2,800,000,000
American Airlines, Inc. | Revolving Credit Facility | Short-term Revolving and Other Facilities
Unusual or Infrequent Item, or Both [Line Items]
Line of credit facility, remaining borrowing capacity			454,000,000
American Airlines, Inc. | Revolving Credit Facility | 2013 Revolving Facility
Unusual or Infrequent Item, or Both [Line Items]
Line of credit facility, remaining borrowing capacity			750,000,000
American Airlines, Inc. | Revolving Credit Facility | 2014 Revolving Facility
Unusual or Infrequent Item, or Both [Line Items]
Line of credit facility, remaining borrowing capacity			1,643,000,000
American Airlines, Inc. | Revolving Credit Facility | April 2016 Revolving Facility
Unusual or Infrequent Item, or Both [Line Items]
Line of credit facility, remaining borrowing capacity			450,000,000
American Airlines, Inc. | Revolving Credit Facility | Secured Debt | 2013 Revolving Facility
Unusual or Infrequent Item, or Both [Line Items]
Repayments of long-term debt			750,000,000
American Airlines, Inc. | Revolving Credit Facility | Secured Debt | 2014 Revolving Facility
Unusual or Infrequent Item, or Both [Line Items]
Repayments of long-term debt			1,600,000,000
American Airlines, Inc. | Revolving Credit Facility | Secured Debt | April 2016 Revolving Facility
Unusual or Infrequent Item, or Both [Line Items]
Repayments of long-term debt			450,000,000
American Airlines, Inc. | Line of Credit | Treasury Loan Agreement, CARES Act
Unusual or Infrequent Item, or Both [Line Items]
Repayments of long-term debt			550,000,000
Line of credit facility, maximum borrowing capacity			$ 7,500,000,000				$ 7,500,000,000	$ 5,500,000,000