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Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Brazilian Federal Revenue Service [Member] item | Dec. 31, 2007 Brazilian Federal Revenue Service [Member] | Dec. 31, 2006 Brazilian Federal Revenue Service [Member] | Dec. 31, 2004 Brazilian Federal Revenue Service [Member] | Jun. 30, 2006 Argentine Tax Authorities [Member]
Income Taxes [Line Items] |  |  |  |  |  |  |
Effective income tax rate | 28.00% | 28.70% |  |  |  |  |
Number of separate tax assessments |  |  | 3 |  |  |  |
Tax assessment received consisting of tax, penalty, and interest |  |  |  | $ 85 | $ 20 | $ 486 | $ 60
Estimated further assessments that could be received |  |  | $ 104 |  |  |  |

X
- Definition This element represents the amount of additional income tax expense that could be received, if BFRS challenges commodity hedging deductions in all tax years for which an audit has not yet been initiated that are still open for assessment. + References No definition available. + Details
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- Definition The sum of estimated tax, penalties and interest associated with tax deductibility challenge in a foreign jurisdiction relating to prior years. + References No definition available. + Details
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- Definition Represents the number of separate tax assessments received. + References No definition available. + Details
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- Definition A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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