Debt - 2017-2 EETCs (Details) - Enhanced Equipment Trust Certificates (EETC) [Member] - 2017-2 EETC [Member] $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($) Aircraft	Dec. 31, 2017 USD ($) Aircraft
Debt Instrument [Line Items]
Number of aircraft financed by debt issuance | Aircraft	30
Repayments of long-term debt | $	$ 283	$ 735
Debt instrument principal amount | $	$ 1,000
Number of aircrafts financed through repurchased debt | Aircraft	6	24
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Number of aircraft financed by debt issuance | Aircraft	30
Repayments of long-term debt | $	$ 283	$ 735
Debt instrument principal amount | $	$ 1,000
Number of aircrafts financed through repurchased debt | Aircraft	6	24