Employee Benefit Plans - Additional Information (Detail)	3 Months Ended
	Jun. 30, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 279,000,000
Supplemental contributions by employer	254,000,000
Minimum contributions by employer	25,000,000
American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	279,000,000
Supplemental contributions by employer	254,000,000
Minimum contributions by employer	$ 25,000,000