Employee Benefit Plans - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 155,000,000
Supplemental contributions by employer	116,000,000
Minimum contributions by employer	39,000,000
American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	155,000,000
Supplemental contributions by employer	116,000,000
Minimum contributions by employer	$ 39,000,000