Share-based Compensation Share-based Compensation - Stock Appreciation Rights (Detail) - Stock Appreciation Rights (SARs) [Member] $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award exchange ratio in connection with the Merger	1
Vesting period	3 years
Non-Option equity instruments, exercised (in shares \| shares	0.8	1.7	3.0
Exercised in period, weighted average exercise price (in usd per share) \| $ / shares	$ 15.71	$ 14.49	$ 12.09
Aggregate intrinsic value, shares exercised \| $	$ 27	$ 49	$ 102
Non-Option equity instruments, outstanding (in shares) \| shares	1.2
Aggregate intrinsic value, outstanding \| $	$ 54
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 8.08
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of contractual expiration period for stock-based awards	7 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of contractual expiration period for stock-based awards	10 years
American Airlines, Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award exchange ratio in connection with the Merger	1
Vesting period	3 years
Non-Option equity instruments, exercised (in shares \| shares	0.8	1.7	3.0
Exercised in period, weighted average exercise price (in usd per share) \| $ / shares	$ 15.71	$ 14.49	$ 12.09
Aggregate intrinsic value, shares exercised \| $	$ 27	$ 49	$ 102
Non-Option equity instruments, outstanding (in shares) \| shares	1.2
Aggregate intrinsic value, outstanding \| $	$ 54
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 8.08
American Airlines, Inc. [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of contractual expiration period for stock-based awards	7 years
American Airlines, Inc. [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of contractual expiration period for stock-based awards	10 years

Share based Compensation Arrangement by Share based Payment Award, Conversion of Awards, Exchange Ratio

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Exercised

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercised in Period, Weighted Average Grant Date Fair Value

+ References

No definition available.

+ Details

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

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- Definition

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

Number of non-option equity instruments exercised by participants.

+ References

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

+ References

No definition available.

+ Details

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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