Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) (Maturity Dates Exceeding One Year [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2015
Corporate Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	$ 1,000
Corporate Obligations [Member] | American Airlines, Inc. [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	338
Bank Notes / Certificates of Deposit / Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	990
Bank Notes / Certificates of Deposit / Time Deposits [Member] | American Airlines, Inc. [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	$ 476