Retirement Benefits - Schedule of One Percentage Point Change in Assumed Health Care Cost Trend Rates (Detail)	12 Months Ended
	Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Impact on 2015 service and interest cost, 1% Increase	$ 3,000,000
Impact on other postretirement benefits obligation as of December 31, 2015, 1% Increase	61,000,000
Impact on 2015 service and interest cost, 1% Decrease	(3,000,000)
Impact on other postretirement benefits obligation as of December 31, 2015, 1% Decrease	(60,000,000)
American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Impact on 2015 service and interest cost, 1% Increase	3,000,000
Impact on other postretirement benefits obligation as of December 31, 2015, 1% Increase	61,000,000
Impact on 2015 service and interest cost, 1% Decrease	(3)
Impact on other postretirement benefits obligation as of December 31, 2015, 1% Decrease	$ (60)