Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Non-cash investing and financing activities:
Settlement of bankruptcy obligations	$ 56	$ 7	$ 0
Supplemental information:
Interest paid, net	944	1,111	1,091
Income taxes paid	6	8	18
American Airlines, Inc.
Non-cash investing and financing activities:
Settlement of bankruptcy obligations	56	7	0
Supplemental information:
Interest paid, net	877	1,025	1,009
Income taxes paid	$ 6	$ 8	$ 16