Appendix 3 Associates and Joint Ventures - Summary of Investments Accounted for Using the Equity Method (Detail)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Electrogas S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Activity	Portfolio company
Taxpayer ID No.	96.806.130-5	96.806.130-5
Company	Electrogas S.A.	Electrogas S.A.
Currency	U.S. dollar	U.S. dollar
Indirect		42.50%
Total		42.50%
Type of Relationship	Associate
Country	Chile
GNL Chile S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Activity	Promotion of liquefied natural gas supply project
Taxpayer ID No.	76.418.940-K	76.418.940-K
Company	GNL Chile S.A.	GNL Chile S.A.
Currency	U.S. dollar	U.S. dollar
Indirect	33.33%	33.33%
Total	33.33%	33.33%
Type of Relationship	Associate
Country	Chile
Centrales Hidroelectricas de Aysen S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Activity	Development and operation of a hydroelectric plant
Taxpayer ID No.	76.652.400-1	76.652.400-1
Company	Centrales Hidroeléctricas De Aysén S.A.	Centrales Hidroeléctricas De Aysén S.A.
Currency	Chilean peso	Chilean peso
Indirect	51.00%	51.00%
Total	51.00%	51.00%
Type of Relationship	Joint venture
Country	Chile
Aysen Transmision S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Activity	Development and operation of a hydroelectric plant
Taxpayer ID No.	76.041.891-9
Company	Aysén Transmisión S.A.
Currency	Chilean peso
Indirect	51.00%	51.00%
Total	51.00%	51.00%
Type of Relationship	Joint venture
Country	Chile
Aysen Energia S.A. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Activity	Development and operation of a hydroelectric plant
Taxpayer ID No.	76.091.595-5
Company	Aysén Energía S.A.
Currency	Chilean peso
Indirect	51.00%	51.00%
Total	51.00%	51.00%
Type of Relationship	Joint venture
Country	Chile
Transmisora Electrica de Quillota Ltda. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Activity	Electric energy transportation and distribution
Taxpayer ID No.	77.017.930-0	77.017.930-0
Company	Transmisora Eléctrica de Quillota Ltda.	Transmisora Eléctrica de Quillota Ltda.
Currency	Chilean peso	Chilean peso
Indirect	50.00%	50.00%
Total	50.00%	50.00%
Type of Relationship	Joint venture
Country	Chile

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The description of the currency of the primary economic environment in which the entity operates.

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The description of the nature of the entity's relationship with an associate (for example, describing the nature of the activities of the associate and whether they are strategic to the entity's activities). [Refer: Associates [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The description of the nature of the entity's relationship with a joint venture (for example, describing the nature of the activities of the joint venture and whether they are strategic to the entity's activities). [Refer: Joint ventures [member]]

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The description of the nature of the related party relationships. [Refer: Related parties [member]]

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