Investments and Fair Value Measurements - Summary of Assets Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) - Maturity Dates Exceeding One Year [Member] - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Bank Notes / Certificates of Deposit / Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	$ 1,200	$ 575
Corporate Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	734	1,100
American Airlines, Inc. [Member] | Bank Notes / Certificates of Deposit / Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	1,200	575
American Airlines, Inc. [Member] | Corporate Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	$ 734	$ 1,100