Employee Benefit Plans - Schedule of Changes in Fair Value of Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	$ 10,053	$ 11,395
Actual return (loss) on plan assets	2,305	(1,151)
Employer contributions	1,230	475
Settlements	(2)	(4)
Benefit payments	(689)	(662)
Fair value of plan assets at end of period	12,897	10,053
Funded status at end of period	(5,461)	(6,325)
Supplemental contributions by employer	444	433
Minimum required cash contribution	786	42
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	225	295
Actual return (loss) on plan assets	41	(24)
Employer contributions	12	35
Settlements	0	0
Benefit payments	(74)	(81)
Fair value of plan assets at end of period	204	225
Funded status at end of period	(620)	(612)
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	10,001	11,340
Actual return (loss) on plan assets	2,292	(1,148)
Employer contributions	1,224	472
Settlements	(2)	(4)
Benefit payments	(686)	(659)
Fair value of plan assets at end of period	12,829	10,001
Funded status at end of period	(5,417)	(6,281)
Supplemental contributions by employer	444	433
Minimum required cash contribution	780	39
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	225	295
Actual return (loss) on plan assets	41	(24)
Employer contributions	12	35
Settlements	0	0
Benefit payments	(74)	(81)
Fair value of plan assets at end of period	204	225
Funded status at end of period	$ (620)	$ (612)