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Investments in Associates and Joint Ventures - Summary of Income from Equity Interests in Associates and Joint Ventures (Detail) - ARS ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Investments in Associates and Joint Ventures [line items] |  |  |
Net income | $ 38,606 | $ 12,672 | $ (28,379)
Other comprehensive income | 172,600 | 21,917 | 27,414
Comprehensive income for the year | 211,206 | 34,589 | (965)
Joint Ventures [member] |  |  |
Disclosure of Investments in Associates and Joint Ventures [line items] |  |  |
Net income | 3,814 | 885 | 363
Other comprehensive income | 4,414 | 628 | 566
Comprehensive income for the year | 8,228 | 1,513 | 929
Associates [member] |  |  |
Disclosure of Investments in Associates and Joint Ventures [line items] |  |  |
Net income | 1,025 | 543 | 225
Other comprehensive income | 406 | 34 | 35
Comprehensive income for the year | $ 1,431 | $ 577 | $ 260

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