Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Accumulated amortization of intangibles	$ 663	$ 622
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 outstanding (in shares)	460,610,870	475,507,887
American Airlines, Inc. [Member]
Accumulated amortization of intangibles	$ 663	$ 622
Common stock, par value (in dollars per share)	$ 1.00	$ 1
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