Debt - Other Financing Activities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Secured and Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, repurchase amount	$ 552
Payment of make-whole premium	57
Write-off of unamortized debt issuance costs and debt discount	6
Secured Debt | American Airlines, Inc.
Debt Instrument [Line Items]
Debt instrument, repurchase amount	539
Payment of make-whole premium	57
Write-off of unamortized debt issuance costs and debt discount	$ 6