Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Accumulated amortization of intangibles	$ 745	$ 704
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,750,000,000	1,750,000,000
Common stock, shares issued (in shares)	621,479,522	428,202,506
Common stock, shares outstanding (in shares)	621,479,522	428,202,506
American Airlines, Inc.
Accumulated amortization of intangibles	$ 745	$ 704
Common stock, par value (in dollars per share)	$ 1.00
Common stock, shares authorized (in shares)	1,000	1,000
Common stock, shares issued (in shares)	1,000	1,000
Common stock, shares outstanding (in shares)	1,000	1,000