REGULATORY MATTERS (Details Textuals)	12 Months Ended
Dec. 31, 2010
Partial Consolidation [Member]
Consolidation [Line Items]
Percentage of fixed assets maintained to adjusted regulatory capital	50.00%
Full Consolidation [Member]
Consolidation [Line Items]
Percentage of fixed assets maintained to adjusted regulatory capital	50.00%

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itub_PercentageOfFixedAssetsMaintainedToAdjustedRegulatoryCapital

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itub

Data Type:

num:percentItemType

Balance Type:

na

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duration