Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Operating Leases
2019	$ 1,912
2020	1,838
2021	1,636
2022	1,438
2023	1,255
2024 and thereafter	3,620
Total lease payments	11,699
Less: Imputed interest	(2,143)
Total operating lease liabilities	9,556
Less: Current obligations	(1,654)	$ 0
Long-term lease obligations	7,902	0
Finance Leases
2019	124
2020	120
2021	118
2022	122
2023	105
2024 and thereafter	282
Total lease payments	871
Less: Imputed interest	(177)
Total finance lease liabilities	694
Less: Current obligations	(81)
Long-term lease obligations	613
American Airlines, Inc. [Member]
Operating Leases
2019	1,894
2020	1,824
2021	1,625
2022	1,428
2023	1,250
2024 and thereafter	3,611
Total lease payments	11,632
Less: Imputed interest	(2,136)
Total operating lease liabilities	9,496
Less: Current obligations	(1,639)	0
Long-term lease obligations	7,857	$ 0
Finance Leases
2019	124
2020	120
2021	118
2022	122
2023	105
2024 and thereafter	282
Total lease payments	871
Less: Imputed interest	(177)
Total finance lease liabilities	694
Less: Current obligations	(81)
Long-term lease obligations	$ 613