Commitments, Contingencies and Guarantees - Long-term Purchase Commitments (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Long-term Purchase Commitment [Line Items]
Equipment purchase deposits	$ 1,209	$ 1,067
American Airlines, Inc. [Member]
Long-term Purchase Commitment [Line Items]
Equipment purchase deposits	$ 1,209	$ 1,067

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.

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