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Income Taxes (TaxReturns) (Details) - 9 months ended Sep. 30, 2018 R$ in Millions, $ in Millions	BRL (R$) jurisdiction	USD ($) jurisdiction
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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- Definition

Maximum number of years the enterprise has agreed to extensions beyond the statute of limitations in two major jurisdictions.

+ References

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- Definition

Represents the number of jurisdictions with extensions beyond the statute of limitations.

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- Definition

Range of period that the tax returns in the major jurisdictions in which the enterprise operates are generally subject to examination.

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- Definition

Estimated amount of loss resulting from an adverse tax position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (d)(3)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

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

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