Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Operating Leases
2020	$ 1,990
2021	1,817
2022	1,620
2023	1,429
2024	1,030
2025 and thereafter	3,276
Total lease payments	11,162
Less: Imputed interest	(2,033)
Total operating lease liabilities	9,129	$ 9,556
Less: Current obligations	(1,708)	(1,654)
Long-term lease obligations	7,421	7,902
Finance Leases
2020	153
2021	128
2022	132
2023	110
2024	116
2025 and thereafter	171
Total lease payments	810
Less: Imputed interest	(140)
Total finance lease liabilities	670	694
Less: Current obligations	(112)	(81)
Long-term lease obligations	558	613
American Airlines, Inc. [Member]
Operating Leases
2020	1,974
2021	1,804
2022	1,608
2023	1,423
2024	1,028
2025 and thereafter	3,268
Total lease payments	11,105
Less: Imputed interest	(2,022)
Total operating lease liabilities	9,083	9,496
Less: Current obligations	(1,695)	(1,639)
Long-term lease obligations	7,388	7,857
Finance Leases
2020	153
2021	128
2022	132
2023	110
2024	116
2025 and thereafter	171
Total lease payments	810
Less: Imputed interest	(140)
Total finance lease liabilities	670	694
Less: Current obligations	(112)	(81)
Long-term lease obligations	$ 558	$ 613