Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1
Interest cost	153	176
Expected return on assets	(252)	(204)
Amortization of:
Prior service cost (benefit)	7	7
Unrecognized net loss (gain)	41	38
Net periodic benefit cost (income)	(50)	18
2020 contributions expected to be deferred under CARES Act	196
Retiree Medical and Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	7	8
Expected return on assets	(4)	(4)
Amortization of:
Prior service cost (benefit)	(54)	(59)
Unrecognized net loss (gain)	(6)	(8)
Net periodic benefit cost (income)	(56)	(62)
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	152	175
Expected return on assets	(251)	(203)
Amortization of:
Prior service cost (benefit)	7	7
Unrecognized net loss (gain)	41	38
Net periodic benefit cost (income)	(50)	18
2020 contributions expected to be deferred under CARES Act	193
American Airlines, Inc. [Member] | Retiree Medical and Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	7	8
Expected return on assets	(4)	(4)
Amortization of:
Prior service cost (benefit)	(54)	(59)
Unrecognized net loss (gain)	(6)	(8)
Net periodic benefit cost (income)	$ (56)	$ (62)