Employee Benefit Plans - Schedule of Amounts Recognized in Consolidated Balance Sheets (Parenthetical) (Detail) - USD ($) $ in Millions |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Defined Benefit Plan Disclosure [Line Items] | ||
| Retiree medical and other postretirement benefits, excluded from noncurrent liability | $ 20 | $ 17 |
| Prior service costs, excluded from noncurrent liability | 1 | 1 |
| American Airlines, Inc. [Member] | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Retiree medical and other postretirement benefits, excluded from noncurrent liability | 20 | 17 |
| Prior service costs, excluded from noncurrent liability | $ 1 | $ 1 |