Employee Benefit Plans - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 281,000,000
Supplemental contributions by employer	256,000,000
Minimum contributions by employer	25,000,000
American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	281,000,000
Supplemental contributions by employer	256,000,000
Minimum contributions by employer	$ 25,000,000