Investments and Fair Value Measurements - Schedule of Carrying Value and Estimated Fair Value of Long-Term Debt, Including Current Maturities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Carrying Value [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Long-term debt, including current maturities	$ 17,904	$ 16,799
Carrying Value [Member] | American Airlines, Inc. [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Long-term debt, including current maturities	11,234	10,809
Fair Value [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Long-term debt, including current maturities	18,542	17,035
Fair Value [Member] | American Airlines, Inc. [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Long-term debt, including current maturities	$ 11,618	$ 11,045