Debt - Components of Long-Term Debt - Equipment Loans and Other Notes Payable Issued in 2017 (Detail) - Secured Debt [Member] - Equipment Loans and Other Notes Payable [Member] $ in Millions |
9 Months Ended |
|---|---|
|
Sep. 30, 2017
USD ($)
| |
| Debt Instrument [Line Items] | |
| Proceeds from notes payable | $ 815 |
| American Airlines, Inc. [Member] | |
| Debt Instrument [Line Items] | |
| Proceeds from notes payable | $ 815 |