Debt - Narrative (Details) $ in Millions	1 Months Ended			3 Months Ended		12 Months Ended
	Mar. 31, 2026 USD ($) aircraft	Feb. 28, 2026	Nov. 30, 2025 USD ($) aircraft pass_through_trust	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($) aircraft
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt				$ 997	$ 325
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, available borrowing capacity	$ 3,510			3,510
American Airlines, Inc.
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt				997	$ 325
American Airlines, Inc. | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, available borrowing capacity	3,510			3,510
Other Revolving Facility | American Airlines, Inc. | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, aggregate commitments	350			350
Other Revolving Facility | Secured Debt | American Airlines, Inc. | Revolving Credit Facility
Debt Instrument [Line Items]
Amount drawn				0
Cargo Receivable Facility | American Airlines, Inc. | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, available borrowing capacity	50			50
2013 Revolving Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, available borrowing capacity	363			363
2013 Revolving Facility | American Airlines, Inc. | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, available borrowing capacity	363			363
2013 Revolving Facility | Line of Credit | American Airlines, Inc. | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, aggregate commitments	363			363
2013 Revolving Facility | Line of Credit | American Airlines, Inc. | Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, aggregate commitments	155			155
2014 Revolving Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, available borrowing capacity	1,296			1,296
2014 Revolving Facility | American Airlines, Inc. | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, available borrowing capacity	1,296			1,296
2014 Revolving Facility | Line of Credit | American Airlines, Inc. | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, aggregate commitments	1,300			1,300
2014 Revolving Facility | Line of Credit | American Airlines, Inc. | Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, aggregate commitments	195			195
2023 Revolving Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, available borrowing capacity	1,451			1,451
2023 Revolving Facility | American Airlines, Inc. | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, available borrowing capacity	1,451			1,451
2023 Revolving Facility | Line of Credit | American Airlines, Inc. | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, aggregate commitments	$ 1,500			$ 1,500
AAdvantage Term Loan Facility, Fourth Amendment | Line of Credit | American Airlines, Inc. | Base Rate | Secured Debt
Debt Instrument [Line Items]
Floor interest rate		0.00%
Debt instrument, basis spread on variable rate, interest rate margin		1.75%
AAdvantage Term Loan Facility, Fourth Amendment | Line of Credit | American Airlines, Inc. | SOFR | Secured Debt
Debt Instrument [Line Items]
Floor interest rate		0.00%
Debt instrument, basis spread on variable rate, interest rate margin		2.75%
2026-1 Aircraft Enhanced Equipment Trust Certificate ("EETCs") | Enhanced Equipment Trust Certificates (EETC) | American Airlines, Inc.
Debt Instrument [Line Items]
Interest rate	5.61%			5.61%
Proceeds from issuance of long-term debt	$ 870
2025-1 Aircraft Enhanced Equipment Trust Certificate ("EETCs") | Enhanced Equipment Trust Certificates (EETC) | American Airlines, Inc.
Debt Instrument [Line Items]
Aggregate principal amount			$ 1,100
Number of pass through trusts | pass_through_trust			2
Number of aircraft delivered or to be delivered | aircraft			25
Proceeds from issuance of long-term debt	$ 127					$ 978
Number of aircrafts financed | aircraft	4					21
8.50% Senior Notes | Secured Debt
Debt Instrument [Line Items]
Interest rate						8.50%
8.50% Senior Notes | Secured Debt | American Airlines, Inc.
Debt Instrument [Line Items]
Interest rate	8.50%			8.50%		8.50%
Repayments of long-term debt				$ 1,000
Senior Unsecured Short Term Loan Facility | American Airlines, Inc. | Unsecured Debt
Debt Instrument [Line Items]
Prepayment of short-term term loan facility				$ 629