Basis of Presentation and Recent Accounting Pronouncement (Details) $ / shares in Units, employee in Thousands, shares in Millions		1 Months Ended			2 Months Ended	3 Months Ended			12 Months Ended
	Apr. 30, 2020 USD ($) shares	Jun. 30, 2020 USD ($)	Apr. 30, 2020 USD ($) shares	Mar. 31, 2020 USD ($)	May 31, 2020	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($) employee	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) $ / shares shares	Feb. 29, 2020 USD ($)	Jan. 31, 2020 USD ($)
Unusual or Infrequent Item, or Both [Line Items]
Decrease in revenue compared to prior year period							20.00%
Number of employees opted for early retirement, a reduced work schedule, or a partially-paid leave status | employee							39
Available liquidity				$ 6,800,000,000			$ 6,800,000,000
Unrestricted cash and short-term investments				3,600,000,000			3,600,000,000
Proceeds from sale-leaseback transactions							280,000,000
Proceeds from issuance of long-term debt							1,698,000,000	$ 400,000,000
Subsequent Event [Member]
Unusual or Infrequent Item, or Both [Line Items]
Borrowings from credit facilities			$ 2,700,000,000
Forecast [Member]
Unusual or Infrequent Item, or Both [Line Items]
Expected decrease in flying compared to prior year period		70.00%			80.00%
Estimated reduction in operating and capital expenditures									$ 12,000,000,000
Average estimated cash burn rate per day		$ 50,000,000				$ 70,000,000
Increase in liquidity from deferral of payroll taxes under CARES Act									$ 300,000,000
Secured Debt [Member] | Delayed Draw Term Loan Facility [Member]
Unusual or Infrequent Item, or Both [Line Items]
Borrowings from credit facilities							1,000,000,000.0
Line of credit facility, maximum borrowing capacity				1,000,000,000.0			$ 1,000,000,000.0
Term							364 days
Covenant, minimum liquidity				2,000,000,000.0			$ 2,000,000,000.0
Senior Notes [Member] | 3.75% Senior Notes [Member]
Unusual or Infrequent Item, or Both [Line Items]
Debt instrument, aggregate principal issued				$ 500,000,000			$ 500,000,000			$ 500,000,000
Interest rate				3.75%			3.75%			3.75%
Senior Notes [Member] | 4.625% Senior Notes [Member]
Unusual or Infrequent Item, or Both [Line Items]
Interest rate				4.625%			4.625%
Repayments of senior notes							$ 500,000,000
United States Government [Member] | Subsequent Event [Member]
Unusual or Infrequent Item, or Both [Line Items]
Approved financial assistance under the CARES Act	$ 5,800,000,000		5,800,000,000
Financial assistance received under the CARES Act			$ 2,900,000,000
Financial assistance received under the CARES Act, percent			50.00%
Warrant, number of shares of common stock (in shares) | shares	6.7		6.7
Warrant threshold percentage increase in principal amount	10.00%
United States Government [Member] | Forecast [Member]
Unusual or Infrequent Item, or Both [Line Items]
Warrant, number of shares of common stock (in shares) | shares									13.7
Exercise price of warrants (in dollars per share) | $ / shares									$ 12.51
United States Government [Member] | Payroll Support Program Promissory Note [Member] | Subsequent Event [Member]
Unusual or Infrequent Item, or Both [Line Items]
Debt instrument, aggregate principal issued	$ 842,000,000		$ 842,000,000
Increase in debt instrument face amount for each disbursement received	30.00%
United States Government [Member] | 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
United States Department Of Treasury [Member] | Forecast [Member]
Unusual or Infrequent Item, or Both [Line Items]
Debt instrument, aggregate principal issued									$ 4,750,000,000
Warrant, number of shares of common stock (in shares) | shares									38.0
Revolving Credit Facility [Member] | Secured Debt [Member]
Unusual or Infrequent Item, or Both [Line Items]
Line of credit facility, remaining borrowing capacity				$ 3,200,000,000			3,200,000,000
Revolving Credit Facility [Member] | Secured Debt [Member] | Subsequent Event [Member]
Unusual or Infrequent Item, or Both [Line Items]
Borrowings from credit facilities			2,700,000,000
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				1,643,000,000			1,643,000,000
Line of credit facility, maximum borrowing capacity				1,200,000,000			$ 1,200,000,000				$ 1,220,000,000
American Airlines, Inc. [Member]
Unusual or Infrequent Item, or Both [Line Items]
Decrease in revenue compared to prior year period							20.00%
Number of employees opted for early retirement, a reduced work schedule, or a partially-paid leave status | employee							39
Available liquidity				6,800,000,000			$ 6,800,000,000
Unrestricted cash and short-term investments				3,600,000,000			3,600,000,000
Proceeds from sale-leaseback transactions							280,000,000
Proceeds from issuance of long-term debt							1,198,000,000	$ 400,000,000
American Airlines, Inc. [Member] | Subsequent Event [Member]
Unusual or Infrequent Item, or Both [Line Items]
Line of credit facility, remaining borrowing capacity	$ 110,000,000		110,000,000
Borrowings from credit facilities			2,700,000,000
American Airlines, Inc. [Member] | Forecast [Member]
Unusual or Infrequent Item, or Both [Line Items]
Expected decrease in flying compared to prior year period		70.00%			80.00%
Estimated reduction in operating and capital expenditures									$ 12,000,000,000
Average estimated cash burn rate per day		$ 50,000,000				$ 70,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Delayed Draw Term Loan Facility [Member]
Unusual or Infrequent Item, or Both [Line Items]
Borrowings from credit facilities							1,000,000,000.0
Line of credit facility, maximum borrowing capacity				$ 1,000,000,000.0			1,000,000,000.0
Term				364 days
Covenant, minimum liquidity				$ 2,000,000,000.0			2,000,000,000.0
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] | United States Government [Member] | Payroll Support Program Promissory Note [Member] | Subsequent Event [Member]
Unusual or Infrequent Item, or Both [Line Items]
Increase in debt instrument face amount for each disbursement received	30.00%
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				3,243,000,000			3,243,000,000
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				1,643,000,000			1,643,000,000
Line of credit facility, maximum borrowing capacity				$ 1,200,000,000			$ 1,200,000,000
American Airlines, Inc. [Member] | Revolving Credit Facility [Member] | Secured Debt [Member] | 2014 Credit Facilities [Member] | Subsequent Event [Member]
Unusual or Infrequent Item, or Both [Line Items]
Borrowings from credit facilities			$ 1,500,000,000