GOODWILL - Changes in Goodwill (Details) - BRL (R$) R$ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in goodwill
Goodwill at beginning of period	R$ 7,891,142	R$ 9,470,016	R$ 15,124,430
Foreign exchange effect	1,221,248	72,531	(2,581,852)
Impairment	0	(849,438)	(2,678,582)
Effect of selling of subsidiary			(393,980)
Transfer to assets held for sale		(801,967)
Goodwill at end of period	9,112,390	7,891,142	9,470,016
Gross
Changes in goodwill
Goodwill at beginning of period	14,500,381	15,059,838	18,099,186
Foreign exchange effect	2,283,577	242,510	(2,645,368)
Effect of selling of subsidiary			(393,980)
Transfer to assets held for sale		(801,967)
Goodwill at end of period	16,783,958	14,500,381	15,059,838
Accumulated impairment losses
Changes in goodwill
Goodwill at beginning of period	(6,609,239)	(5,589,822)	(2,974,756)
Foreign exchange effect	(1,062,329)	(169,979)	63,516
Impairment		(849,438)	(2,678,582)
Goodwill at end of period	R$ (7,671,568)	R$ (6,609,239)	R$ (5,589,822)

The decrease in goodwill due to classification as held for sale. [Refer: Goodwill; Disposal groups classified as held for sale [member]]

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

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The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

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The amount of goodwill derecognised without having previously been included in a disposal group classified as held for sale. [Refer: Goodwill; Disposal groups classified as held for sale [member]]

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The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill]

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The increase (decrease) in goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Goodwill]

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