Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating leases:
Operating lease ROU assets	$ 8,039	$ 8,737
Current operating lease liabilities	1,651	1,708
Noncurrent operating lease liabilities	6,777	7,421
Total operating lease liabilities	8,428	9,129
Finance leases:
Property and equipment, at cost	1,021	954
Accumulated amortization	(539)	(447)
Property and equipment, net	482	507
Current finance lease liabilities	100	112
Noncurrent finance lease liabilities	472	558
Total finance lease liabilities	$ 572	$ 670
Weighted average remaining lease term:
Operating leases	7 years 4 months 24 days	7 years 4 months 24 days
Finance leases	5 years 4 months 24 days	6 years 2 months 12 days
Weighted average discount rate:
Operating leases	5.60%	4.70%
Finance leases	6.30%	6.20%
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligations
American Airlines, Inc.
Operating leases:
Operating lease ROU assets	$ 7,994	$ 8,694
Current operating lease liabilities	1,641	1,695
Noncurrent operating lease liabilities	6,739	7,388
Total operating lease liabilities	8,380	9,083
Finance leases:
Property and equipment, at cost	1,021	954
Accumulated amortization	(539)	(447)
Property and equipment, net	482	507
Current finance lease liabilities	100	112
Noncurrent finance lease liabilities	472	558
Total finance lease liabilities	$ 572	$ 670
Weighted average remaining lease term:
Operating leases	7 years 4 months 24 days	7 years 4 months 24 days
Finance leases	5 years 4 months 24 days	6 years 2 months 12 days
Weighted average discount rate:
Operating leases	5.60%	4.70%
Finance leases	6.30%	6.20%
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligations