Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Operating leases:
Operating lease ROU assets	$ 8,737	$ 9,151
Current operating lease liabilities	1,708	1,654
Noncurrent operating lease liabilities	7,421	7,902
Total operating lease liabilities	9,129	9,556
Finance leases:
Property and equipment, at cost	954	936
Accumulated amortization	(447)	(391)
Property and equipment, net	507	545
Current finance lease liabilities	112	81
Noncurrent finance lease liabilities	558	613
Total finance lease liabilities	$ 670	$ 694
Weighted average remaining lease term:
Operating leases	7 years 4 months 24 days	7 years 7 months 6 days
Finance leases	6 years 2 months 12 days	7 years 4 months 24 days
Weighted average discount rate:
Operating leases	4.70%	4.60%
Finance leases	6.20%	6.50%
American Airlines, Inc. [Member]
Operating leases:
Operating lease ROU assets	$ 8,694	$ 9,094
Current operating lease liabilities	1,695	1,639
Noncurrent operating lease liabilities	7,388	7,857
Total operating lease liabilities	9,083	9,496
Finance leases:
Property and equipment, at cost	954	936
Accumulated amortization	(447)	(391)
Property and equipment, net	507	545
Current finance lease liabilities	112	81
Noncurrent finance lease liabilities	558	613
Total finance lease liabilities	$ 670	$ 694
Weighted average remaining lease term:
Operating leases	7 years 4 months 24 days	7 years 7 months 6 days
Finance leases	6 years 2 months 12 days	7 years 4 months 24 days
Weighted average discount rate:
Operating leases	4.70%	4.60%
Finance leases	6.20%	6.50%