Retirement Benefits - Schedule of Changes in Fair Value of Plan Assets (Parenthetical) (Detail) $ in Millions	Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Trust assets	$ 24
American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Trust assets	$ 24

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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