Accumulated Other Comprehensive Loss - Reclassifications out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications out of AOCI	$ (18)	$ (17)	$ (34)	$ (33)
Prior service benefit [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications out of AOCI	(41)	(40)	(81)	(80)
Actuarial loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications out of AOCI	23	23	47	47
American Airlines, Inc. [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications out of AOCI	(18)	(17)	(34)	(33)
American Airlines, Inc. [Member] | Prior service benefit [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications out of AOCI	(41)	(40)	(81)	(80)
American Airlines, Inc. [Member] | Actuarial loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications out of AOCI	$ 23	$ 23	$ 47	$ 47