The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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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

Stated as a percentage, the estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose) divided by its [historical] capitalized cost.

+ References

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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Basis of Presentation and Summary of Significant Accounting Policies - Operating Property and Equipment (Detail) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Depreciation	$ 2.2	$ 1.9	$ 1.7
Minimum [Member] \| Aircraft, Engines and Related Rotable Parts [Member]
Property, Plant and Equipment [Line Items]
Residual value percentage of equipment and properties	5.00%
Depreciable Life	20 years
Minimum [Member] \| Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
Minimum [Member] \| Furniture, Fixtures and Other Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	3 years
Minimum [Member] \| Capitalized Software [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
Maximum [Member] \| Aircraft, Engines and Related Rotable Parts [Member]
Property, Plant and Equipment [Line Items]
Residual value percentage of equipment and properties	10.00%
Depreciable Life	30 years
Maximum [Member] \| Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	30 years
Maximum [Member] \| Furniture, Fixtures and Other Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	10 years
Maximum [Member] \| Capitalized Software [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	10 years
American Airlines, Inc. [Member]
Property, Plant and Equipment [Line Items]
Depreciation	$ 2.1	$ 1.8	$ 1.6
American Airlines, Inc. [Member] \| Minimum [Member] \| Aircraft, Engines and Related Rotable Parts [Member]
Property, Plant and Equipment [Line Items]
Residual value percentage of equipment and properties	5.00%
Depreciable Life	20 years
American Airlines, Inc. [Member] \| Minimum [Member] \| Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
American Airlines, Inc. [Member] \| Minimum [Member] \| Furniture, Fixtures and Other Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	3 years
American Airlines, Inc. [Member] \| Minimum [Member] \| Capitalized Software [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
American Airlines, Inc. [Member] \| Maximum [Member] \| Aircraft, Engines and Related Rotable Parts [Member]
Property, Plant and Equipment [Line Items]
Residual value percentage of equipment and properties	10.00%
Depreciable Life	30 years
American Airlines, Inc. [Member] \| Maximum [Member] \| Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	30 years
American Airlines, Inc. [Member] \| Maximum [Member] \| Furniture, Fixtures and Other Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	10 years
American Airlines, Inc. [Member] \| Maximum [Member] \| Capitalized Software [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	10 years