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Income Taxes (TaxReturns) (Details) - 9 months ended Sep. 30, 2018 R$ in Millions, $ in Millions | BRL (R$) jurisdiction | USD ($) jurisdiction
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Income Tax Examination |  |
Number of jurisdictions with extensions beyond statute of limitations | 2 | 2
Maximum number of years agreed to extensions beyond the statute of limitations | 20 years | 20 years
Net adjustments of additional taxes, including interest and penalties | R$ 946 | $ 234
Minimum |  |
Income Tax Examination |  |
Range of tax returns are subject to examination | 3 years | 3 years
Maximum |  |
Income Tax Examination |  |
Range of tax returns are subject to examination | 6 years | 6 years

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