Debt - Schedule of Maturities of Long-Term Debt and Capital Leases (Detail) $ in Millions	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
2018	$ 2,598
2019	2,868
2020	4,069
2021	2,856
2022	1,288
2023 and thereafter	11,622
Total	25,301
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
2018	2,098
2019	2,118
2020	3,563
2021	2,854
2022	1,286
2023 and thereafter	11,602
Total	$ 23,521