Revenue Recognition - Passenger Revenue by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Airline Destination Disclosure [Line Items]
Operating revenues	$ 8,969	$ 3,173	$ 20,455	$ 13,309
Passenger
Airline Destination Disclosure [Line Items]
Operating revenues	7,957	2,540	17,682	11,328
Passenger | Domestic
Airline Destination Disclosure [Line Items]
Operating revenues	6,547	2,296	14,646	9,102
Passenger | Latin America
Airline Destination Disclosure [Line Items]
Operating revenues	957	172	2,375	1,386
Passenger | Atlantic
Airline Destination Disclosure [Line Items]
Operating revenues	408	56	555	621
Passenger | Pacific
Airline Destination Disclosure [Line Items]
Operating revenues	45	16	106	219
American Airlines, Inc.
Airline Destination Disclosure [Line Items]
Operating revenues	8,968	3,172	20,454	13,308
American Airlines, Inc. | Passenger
Airline Destination Disclosure [Line Items]
Operating revenues	7,957	2,540	17,682	11,328
American Airlines, Inc. | Passenger | Domestic
Airline Destination Disclosure [Line Items]
Operating revenues	6,547	2,296	14,646	9,102
American Airlines, Inc. | Passenger | Latin America
Airline Destination Disclosure [Line Items]
Operating revenues	957	172	2,375	1,386
American Airlines, Inc. | Passenger | Atlantic
Airline Destination Disclosure [Line Items]
Operating revenues	408	56	555	621
American Airlines, Inc. | Passenger | Pacific
Airline Destination Disclosure [Line Items]
Operating revenues	$ 45	$ 16	$ 106	$ 219