Legal Proceedings (Details) shares in Millions, $ in Millions	Jun. 15, 2018 USD ($) lawsuit	Mar. 31, 2021 shares
Long-term Purchase Commitment [Line Items]
Common stock held in Disputed Claims reserve (in shares) | shares		4.8
Number of putative class action lawsuits | lawsuit	100
Preliminary settlement amount | $	$ 45
American Airlines, Inc.
Long-term Purchase Commitment [Line Items]
Common stock held in Disputed Claims reserve (in shares) | shares		4.8
Number of putative class action lawsuits | lawsuit	100
Preliminary settlement amount | $	$ 45