Accumulated Other Comprehensive Loss - Reclassifications out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications out of AOCI	$ (18)	$ (17)	$ (52)	$ (49)
Prior service benefit [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications out of AOCI	(40)	(40)	(121)	(121)
Actuarial loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications out of AOCI	22	23	69	72
American Airlines, Inc. [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications out of AOCI	(18)	(17)	(52)	(50)
American Airlines, Inc. [Member] | Prior service benefit [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications out of AOCI	(40)	(40)	(121)	(121)
American Airlines, Inc. [Member] | Actuarial loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications out of AOCI	$ 22	$ 23	$ 69	$ 71