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Note 30 - Contingent Liability - Estimates of Amounts of Possible Losses (Details) - BRL (R$) R$ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Statement Line Items [Line Items] |  |
Estimates of amounts of possible losses | R$ 72,055.5 | R$ 60,520.0
Income tax and social contribution [member] |  |
Statement Line Items [Line Items] |  |
Estimates of amounts of possible losses | 37,867.4 | 31,757.3
Value added and excise taxes [member] |  |
Statement Line Items [Line Items] |  |
Estimates of amounts of possible losses | 23,891.4 | 19,805.5
PIS and COFINS tax contingent liability [member] |  |
Statement Line Items [Line Items] |  |
Estimates of amounts of possible losses | 4,386.3 | 3,485.2
Labor contingent liability [member] |  |
Statement Line Items [Line Items] |  |
Estimates of amounts of possible losses | 353.4 | 287.1
Civil proceedings contingent liability [member] |  |
Statement Line Items [Line Items] |  |
Estimates of amounts of possible losses | 4,385.7 | 4,071.5
Other contingent liabilities [member] |  |
Statement Line Items [Line Items] |  |
Estimates of amounts of possible losses | R$ 1,171.3 | R$ 1,113.4

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