Debt - Narrative (Details) $ / shares in Units, $ in Millions					9 Months Ended
	Jul. 01, 2025 USD ($) day $ / shares	May 28, 2025 USD ($)	Mar. 27, 2025 day $ / shares	Mar. 24, 2025 USD ($)	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Total long-term debt					$ 28,365	$ 30,118
Secured Debt
Debt Instrument [Line Items]
Total long-term debt					24,619	25,372
Secured Debt | American Airlines, Inc.
Debt Instrument [Line Items]
Total long-term debt					24,619	25,372
2021 AAdvantage Term Loan Facility | Secured Debt
Debt Instrument [Line Items]
Total long-term debt					2,269	2,450
2021 AAdvantage Term Loan Facility | Secured Debt | American Airlines, Inc.
Debt Instrument [Line Items]
Total long-term debt				$ 2,300	2,269	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%
2025 AAdvantage Term Loan Facility | Secured Debt
Debt Instrument [Line Items]
Total long-term debt					998	0
2025 AAdvantage Term Loan Facility | Secured Debt | American Airlines, Inc.
Debt Instrument [Line Items]
Total long-term debt		$ 1,000			$ 998	0
AAdvantage Term Loan Facility, Third Amendment | Secured Debt | American Airlines, Inc.
Debt Instrument [Line Items]
Aggregate principal amount		1,000
Quarterly principal amortization payable		$ 3
Scheduled quarterly principal amortization amount, percentage of original aggregate principal amount		0.25%
AAdvantage Term Loan Facility, Third 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		2.25%
AAdvantage Term Loan Facility, Third 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		3.25%
6.50% Senior Notes | Senior Notes
Debt Instrument [Line Items]
Interest rate					6.50%
Conversion of common stock (in dollars per share) | $ / shares	$ 22.00		$ 22.00
Convertible debt, threshold trading days (in days) | day	20		20
Settlement of convertible debt	$ 1,000
Equipment Loans and Other Notes Payable Issued in Current Year | Secured Debt | American Airlines, Inc.
Debt Instrument [Line Items]
Proceeds from secured notes payable					$ 1,200
Average interest rate					6.05%
Equipment Loans and Other Notes Payable Issued in Current Year | Secured Debt | American Airlines, Inc. | SOFR
Debt Instrument [Line Items]
Average interest rate					6.05%
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					$ 6,211	7,271
Average interest rate					3.77%
Enhanced Equipment Trust Certificates (EETC) | Secured Debt | American Airlines, Inc.
Debt Instrument [Line Items]
Total long-term debt					$ 6,211	$ 7,271
Repayments of debt					$ 487
Average interest rate					3.77%