Debt - 2017-2 EETCs (Details) - Enhanced Equipment Trust Certificates (EETC) [Member] - 2017-2 EETC [Member] $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Oct. 31, 2017 USD ($) trust	Jun. 30, 2018 USD ($) Aircraft	Dec. 31, 2017 USD ($) Aircraft
Debt Instrument [Line Items]
Number of pass through trusts issued | trust	3
Debt instrument principal amount | $	$ 1,000
Repayments of long-term debt | $		$ 283	$ 735
Number of aircrafts financed through repurchased debt | Aircraft		6	24
Number of aircraft financed by debt issuance | Aircraft		30
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Number of pass through trusts issued | trust	3
Debt instrument principal amount | $	$ 1,000
Repayments of long-term debt | $		$ 283	$ 735
Number of aircrafts financed through repurchased debt | Aircraft		6	24
Number of aircraft financed by debt issuance | Aircraft		30