Basis of Presentation and Recent Accounting Pronouncement (Details)	1 Months Ended		2 Months Ended	3 Months Ended			6 Months Ended			12 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares	Apr. 30, 2020 USD ($) shares	May 31, 2020 USD ($)	Sep. 30, 2020	Jun. 30, 2020 USD ($) $ / shares shares	Mar. 31, 2020	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) employee $ / shares shares	Jun. 30, 2019 USD ($)	Dec. 31, 2020 USD ($) shares	Jul. 30, 2020 shares	May 29, 2020 shares	Feb. 29, 2020 USD ($)
Unusual or Infrequent Item, or Both [Line Items]
Decrease in revenue compared to prior year period					(86.00%)	(20.00%)
Decrease in flying compared to prior year period					76.00%
Number of positions eliminated | employee								5,100
Number of positions eliminated, percent								30.00%
Number of team members opted for early retirement, a reduced work schedule or partially paid leave | employee								41,000
Available liquidity	$ 10,200,000,000				$ 10,200,000,000			$ 10,200,000,000
Unrestricted cash and short-term investments	$ 9,800,000,000				$ 9,800,000,000			$ 9,800,000,000
Issuance of shares of AAG common stock pursuant to a public stock offering (in shares) | shares					85,215,000			85,200,000
Price per share (in dollars per share) | $ / shares	$ 13.50				$ 13.50			$ 13.50
Issuance of AAG common stock pursuant to a public stock offering					$ 1,113,000,000			$ 1,100,000,000
Proceeds from issuance of long-term debt								9,464,000,000	$ 2,589,000,000
Approved financial assistance under the CARES Act	$ 5,800,000,000				5,800,000,000			5,800,000,000
Financial assistance received under the CARES Act								$ 5,200,000,000
Financial assistance received under the CARES Act, percent								90.00%
Financial assistance, CARES Act					2,000,000,000.0
Financial assistance, CARES Act, deferred	$ 1,700,000,000				$ 1,700,000,000			$ 1,700,000,000
Warrant, number of shares of common stock (in shares) | shares	38,000,000.0				38,000,000.0			38,000,000.0
Exercise price of warrants (in dollars per share) | $ / shares	$ 12.51				$ 12.51			$ 12.51
Forecast [Member]
Unusual or Infrequent Item, or Both [Line Items]
Decrease in flying compared to prior year period				60.00%
Estimated reduction in operating and capital expenditures										$ 15,000,000,000.0
Increase in liquidity from deferral of payroll taxes under CARES Act										300,000,000
Financial assistance, CARES Act							$ 4,000,000,000.0
Payroll Support Program Promissory Note [Member]
Unusual or Infrequent Item, or Both [Line Items]
Debt instrument, aggregate principal issued	$ 1,500,000,000				$ 1,500,000,000			$ 1,500,000,000
Warrant, number of shares of common stock (in shares) | shares	12,300,000				12,300,000			12,300,000
Payroll Support Program Promissory Note [Member] | Forecast [Member]
Unusual or Infrequent Item, or Both [Line Items]
Debt instrument, aggregate principal issued										$ 1,700,000,000
Warrant, number of shares of common stock (in shares) | shares										13,700,000
CARES Act Secured Loan [Member]
Unusual or Infrequent Item, or Both [Line Items]
Debt instrument, aggregate principal issued	$ 4,750,000,000				$ 4,750,000,000			$ 4,750,000,000
Secured Debt [Member] | 11.75% Senior Notes [Member]
Unusual or Infrequent Item, or Both [Line Items]
Interest rate	11.75%				11.75%			11.75%
Secured Debt [Member] | Equipment Loans and Other Notes Payable Maturing 2029 Through 2032 [Member]
Unusual or Infrequent Item, or Both [Line Items]
Proceeds from sale-leaseback transactions								$ 336,000,000
Senior Notes [Member] | 3.75% Senior Notes [Member]
Unusual or Infrequent Item, or Both [Line Items]
Debt instrument, aggregate principal issued													$ 500,000,000
Interest rate													3.75%
Senior Notes [Member] | 4.625% Senior Notes [Member]
Unusual or Infrequent Item, or Both [Line Items]
Interest rate						4.625%
Repayments of senior notes								500,000,000
Senior Notes [Member] | 6.50% Senior Notes [Member]
Unusual or Infrequent Item, or Both [Line Items]
Debt instrument, aggregate principal issued	$ 1,000,000,000				$ 1,000,000,000			$ 1,000,000,000
Interest rate	6.50%				6.50%			6.50%
Proceeds from issuance of long-term debt	$ 970,000,000
Senior Notes [Member] | Special Facility Revenue Bonds [Member]
Unusual or Infrequent Item, or Both [Line Items]
Repayments of long-term debt								$ 47,000,000
Revolving Credit Facility [Member] | Secured Debt [Member]
Unusual or Infrequent Item, or Both [Line Items]
Line of credit facility, remaining borrowing capacity	400,000,000				$ 400,000,000			400,000,000
American Airlines, Inc. [Member]
Unusual or Infrequent Item, or Both [Line Items]
Decrease in revenue compared to prior year period					(86.00%)
Available liquidity	10,200,000,000				$ 10,200,000,000			10,200,000,000
Unrestricted cash and short-term investments	9,800,000,000				9,800,000,000			9,800,000,000
Proceeds from issuance of long-term debt								6,868,000,000	$ 1,839,000,000
Minimum liquidity	$ 2,000,000,000.0				$ 2,000,000,000.0			$ 2,000,000,000.0
American Airlines, Inc. [Member] | Secured Debt [Member] | 11.75% Senior Notes [Member]
Unusual or Infrequent Item, or Both [Line Items]
Interest rate	11.75%				11.75%			11.75%
American Airlines, Inc. [Member] | Secured Debt [Member] | Delayed Draw Term Loan Facility [Member]
Unusual or Infrequent Item, or Both [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,000,000,000.0				$ 1,000,000,000.0			$ 1,000,000,000.0
American Airlines, Inc. [Member] | Secured Debt [Member] | Special Facility Revenue Bonds [Member]
Unusual or Infrequent Item, or Both [Line Items]
Repayments of long-term debt	47,000,000
Proceeds from issuance of long-term debt	353,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Equipment Loans and Other Notes Payable Maturing 2029 Through 2032 [Member]
Unusual or Infrequent Item, or Both [Line Items]
Proceeds from issuance of long-term debt								197,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Equipment Loans and Other Notes Payable [Member]
Unusual or Infrequent Item, or Both [Line Items]
Repayments of long-term debt								17,000,000
American Airlines, Inc. [Member] | Senior Notes [Member] | 11.75% Senior Notes [Member]
Unusual or Infrequent Item, or Both [Line Items]
Debt instrument, aggregate principal issued	$ 2,500,000,000				$ 2,500,000,000			$ 2,500,000,000
Interest rate	11.75%				11.75%			11.75%
American Airlines, Inc. [Member] | Senior Notes [Member] | Special Facility Revenue Bonds [Member]
Unusual or Infrequent Item, or Both [Line Items]
Debt instrument, aggregate principal issued	$ 360,000,000				$ 360,000,000			$ 360,000,000
American Airlines, Inc. [Member] | Revolving Credit Facility [Member] | Secured Debt [Member]
Unusual or Infrequent Item, or Both [Line Items]
Line of credit facility, remaining borrowing capacity	400,000,000				400,000,000			400,000,000
American Airlines, Inc. [Member] | Revolving Credit Facility [Member] | Secured Debt [Member] | 2014 Credit Facilities [Member]
Unusual or Infrequent Item, or Both [Line Items]
Line of credit facility, remaining borrowing capacity			$ 0
Line of credit facility, maximum borrowing capacity	$ 1,200,000,000				$ 1,200,000,000			$ 1,200,000,000
Borrowings from credit facilities			$ 1,600,000,000
American Airlines, Inc. [Member] | Revolving Credit Facility [Member] | Secured Debt [Member] | April 2016 Credit Facilities [Member]
Unusual or Infrequent Item, or Both [Line Items]
Line of credit facility, remaining borrowing capacity		$ 0
Borrowings from credit facilities		450,000,000
American Airlines, Inc. [Member] | Revolving Credit Facility [Member] | Secured Debt [Member] | 2013 Credit Facilities [Member]
Unusual or Infrequent Item, or Both [Line Items]
Line of credit facility, remaining borrowing capacity		0
Borrowings from credit facilities		$ 750,000,000
Warrants Tranche 1 [Member]
Unusual or Infrequent Item, or Both [Line Items]
Warrant, number of shares of common stock (in shares) | shares		6,700,000
Warrants Tranche 2 [Member]
Unusual or Infrequent Item, or Both [Line Items]
Warrant, number of shares of common stock (in shares) | shares												2,800,000
Warrants Tranche 3 [Member]
Unusual or Infrequent Item, or Both [Line Items]
Warrant, number of shares of common stock (in shares) | shares	2,800,000				2,800,000			2,800,000
Warrants Tranche 4 [Member] | Forecast [Member]
Unusual or Infrequent Item, or Both [Line Items]
Warrant, number of shares of common stock (in shares) | shares											1,400,000