Debt - Narrative (Details) $ / shares in Units, $ in Millions			3 Months Ended
	Mar. 27, 2025 day $ / shares	Mar. 24, 2025 USD ($)	Mar. 31, 2025 USD ($) day	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Total long-term debt			$ 29,185	$ 30,118
Secured Debt
Debt Instrument [Line Items]
Total long-term debt			24,439	25,372
Secured Debt | American Airlines, Inc.
Debt Instrument [Line Items]
Total long-term debt			24,439	25,372
AAdvantage Term Loan Facility | Secured Debt
Debt Instrument [Line Items]
Total long-term debt			2,275	2,450
AAdvantage Term Loan Facility | Secured Debt | American Airlines, Inc.
Debt Instrument [Line Items]
Total long-term debt		$ 2,300	$ 2,275	2,450
AAdvantage Term Loan Facility, Second Amendment | Secured Debt | American Airlines, Inc.
Debt Instrument [Line Items]
Aggregate principal amount		$ 2,300
Scheduled quarterly principal amortization amount, percentage of principal amount of loans outstanding		0.25%
Quarterly principal amortization payable		$ 6
AAdvantage Term Loan Facility, Second Amendment | Secured Debt | American Airlines, Inc. | Base Rate
Debt Instrument [Line Items]
Floor interest rate		0.00%
Debt instrument, basis spread on variable rate, interest rate margin		1.25%
AAdvantage Term Loan Facility, Second Amendment | Secured Debt | American Airlines, Inc. | SOFR
Debt Instrument [Line Items]
Floor interest rate		0.00%
Debt instrument, basis spread on variable rate, interest rate margin		2.25%
6.50% Senior Notes | Senior Notes
Debt Instrument [Line Items]
Interest rate			6.50%
Conversion terms, percentage sales price exceeds conversion price			130.00%
Convertible debt, threshold trading days (in days) | day	20		20
Convertible debt, threshold consecutive trading days (in days) | day			30
Conversion ratio			0.0617284
Conversion of common stock (in dollars per share) | $ / shares	$ 22.00
Equipment Loans and Other Notes Payable Issued in Current Year | Secured Debt | American Airlines, Inc.
Debt Instrument [Line Items]
Proceeds from secured notes payable			$ 368
Average interest rate			6.15%
Equipment Loans and Other Notes Payable Issued in Current Year | Secured Debt | American Airlines, Inc. | SOFR
Debt Instrument [Line Items]
Average interest rate			6.15%
10.75% Senior Secured Notes, IP Notes And 10.75% Senior Secured Notes, LGA/DCA Notes | Secured Debt | American Airlines, Inc.
Debt Instrument [Line Items]
Repayments of debt			$ 308
10.75% Senior Secured Notes, IP Notes | Secured Debt
Debt Instrument [Line Items]
Total long-term debt			$ 524	781
Interest rate			10.75%
10.75% Senior Secured Notes, IP Notes | Secured Debt | American Airlines, Inc.
Debt Instrument [Line Items]
Total long-term debt			$ 524	781
Interest rate			10.75%
10.75% Senior Secured Notes, LGA/DCA Notes | Secured Debt
Debt Instrument [Line Items]
Total long-term debt			$ 105	156
Interest rate			10.75%
10.75% Senior Secured Notes, LGA/DCA Notes | Secured Debt | American Airlines, Inc.
Debt Instrument [Line Items]
Total long-term debt			$ 105	156
Interest rate			10.75%
Enhanced Equipment Trust Certificates (EETC) | Secured Debt
Debt Instrument [Line Items]
Total long-term debt			$ 6,894	7,271
Average interest rate			3.80%
Enhanced Equipment Trust Certificates (EETC) | Secured Debt | American Airlines, Inc.
Debt Instrument [Line Items]
Total long-term debt			$ 6,894	$ 7,271
Average interest rate			3.80%
Repayments of debt			$ 144