Accumulated Other Comprehensive Income (Loss) - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified from accumulated other comprehensive income (loss), net of tax	$ (55)	$ (65)
Prior Service Benefit [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified from accumulated other comprehensive income (loss), net of tax	(132)	(134)
Actuarial Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified from accumulated other comprehensive income (loss), net of tax	77	69
American Airlines, Inc. [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified from accumulated other comprehensive income (loss), net of tax	(55)	(65)
American Airlines, Inc. [Member] | Prior Service Benefit [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified from accumulated other comprehensive income (loss), net of tax	(132)	(134)
American Airlines, Inc. [Member] | Actuarial Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified from accumulated other comprehensive income (loss), net of tax	$ 77	$ 69