Debt - 2017-2 EETCs (Detail) - Enhanced Equipment Trust Certificates (EETC) [Member] - 2017-2 EETC [Member] $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2018 USD ($) Aircraft	Dec. 31, 2017 USD ($) Aircraft
Debt Instrument [Line Items]
Repayments of long-term debt	$ 210	$ 735
Debt instrument principal amount	$ 1,000
Number of aircrafts financed through repurchased debt \| Aircraft	4	24
Number of aircraft financed by debt issuance \| Aircraft	30
Debt instrument, remaining escrowed proceeds	$ 73
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Repayments of long-term debt	210	$ 735
Debt instrument principal amount	$ 1,000
Number of aircrafts financed through repurchased debt \| Aircraft	4	24
Number of aircraft financed by debt issuance \| Aircraft	30
Debt instrument, remaining escrowed proceeds	$ 73

Number of aircraft financed by debt issuance.

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- Definition

Number Of Aircrafts Financed Through Repurchased Debt

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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