Basis of Presentation and Summary of Significant Accounting Policies - Fuel Financing Obligation Rollforward (Details) - Fuel Financing Arrangement - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Short-Term Bank Loans And Notes Payable [Roll Forward]
Balance at beginning of year	$ 74	$ 0
Proceeds	1,217	74
Payments	(377)	0
Balance at end of year	914	74
American Airlines, Inc.
Short-Term Bank Loans And Notes Payable [Roll Forward]
Balance at beginning of year	74	0
Proceeds	1,217	74
Payments	(377)	0
Balance at end of year	$ 914	$ 74