Leases - Future Minimum Lease Payments (Details) $ in Millions	Dec. 31, 2017 USD ($)
Operating Leases
2018	$ 2,572
2019	2,329
2020	2,104
2021	1,621
2022	1,398
2023 and thereafter	3,965
Total lease payments	13,989
Capital Leases
2018	126
2019	123
2020	120
2021	118
2022	122
2023 and thereafter	387
Total lease payments	996
Less: Imputed interest	(225)
Total lease obligations	771
Less: Current obligations	(78)
Long-term lease obligations	693
American Airlines, Inc. [Member]
Operating Leases
2018	2,555
2019	2,321
2020	2,096
2021	1,613
2022	1,394
2023 and thereafter	3,952
Total lease payments	13,931
Capital Leases
2018	126
2019	123
2020	120
2021	118
2022	122
2023 and thereafter	387
Total lease payments	996
Less: Imputed interest	(225)
Total lease obligations	771
Less: Current obligations	(78)
Long-term lease obligations	$ 693