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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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{us-gaap_DerivativeByNatureAxis} : Foreign exchange forward contracts [Member]
12/31/2010
USD ($)
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{us-gaap_DerivativeByNatureAxis} : Foreign exchange forward contracts [Member]
12/31/2009
USD ($)
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{us-gaap_DerivativeByNatureAxis} : Foreign currency option contracts [Member]
12/31/2010
USD ($)
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{us-gaap_DerivativeByNatureAxis} : Foreign currency option contracts [Member]
12/31/2009
USD ($)
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{us-gaap_DerivativeByNatureAxis} : Futures contracts [Member]
12/31/2010
USD ($)
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{us-gaap_DerivativeByNatureAxis} : Futures contracts [Member]
12/31/2009
USD ($)
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{us-gaap_DerivativeByNatureAxis} : Credit default swaps (protection purchased) [Member]
12/31/2010
USD ($)
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{us-gaap_DerivativeByNatureAxis} : Credit default swaps (protection purchased) [Member]
12/31/2009
USD ($)
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These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</ElementDefenition><IsTotalLabel>false</IsTotalLabel><IsEPS>false</IsEPS><Label>Derivative [Line Items]</Label></Row><Row><Id>32</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><Level>0</Level><ElementName>invest_DerivativeNotionalAmount</ElementName><ElementPrefix>invest</ElementPrefix><IsBaseElement>false</IsBaseElement><BalanceType>na</BalanceType><PeriodType>instant</PeriodType><ShortDefinition>No definition available.</ShortDefinition><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsSubReportEnd>false</IsSubReportEnd><IsCalendarTitle>false</IsCalendarTitle><IsTuple>false</IsTuple><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole /><FootnoteIndexer /><Cells><Cell><Id>1</Id><IsNumeric>true</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>113752000</NumericAmount><RoundedNumericAmount>113752</RoundedNumericAmount><NonNumbericText /><NonNumericTextHeader /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell><Cell><Id>2</Id><IsNumeric>true</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>192996000</NumericAmount><RoundedNumericAmount>192996</RoundedNumericAmount><NonNumbericText /><NonNumericTextHeader /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Monetary</Unit><ElementDataType>xbrli:monetaryItemType</ElementDataType><SimpleDataType>monetary</SimpleDataType><ElementDefenition>Total monetary amount specified by the derivative(s). 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{us-gaap_DerivativeByNatureAxis} : Credit default swaps (assumed risks) [Member]
12/31/2010
USD ($)
</KeyName><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID>AS_OF_Dec31_2010_us-gaap_DerivativeByNatureAxis_CreditDefaultSwapsAssumedRisksMember_pre_HedgingDesignationAxis_NondesignatedMember</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0000911421</EntityValue><PeriodDisplayName /><PeriodType>instant</PeriodType><PeriodStartDate>2010-12-31T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Derivates not designated as hedges [Member]</ValueName><ValueType>pre_HedgingDesignationAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_NondesignatedMember</Id><dimensionId>pre_HedgingDesignationAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Credit default swaps (assumed risks) [Member]</ValueName><ValueType>us-gaap_DerivativeByNatureAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>pre_CreditDefaultSwapsAssumedRisksMember</Id><dimensionId>us-gaap_DerivativeByNatureAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS><UnitProperty><UnitID>USD</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty></UPS><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Id="1" Label="Derivates not designated as hedges [Member]" /><Label Id="2" Label="Credit default swaps (assumed risks) [Member]" /><Label Id="3" Label="12/31/2010" /></Labels></Columns><Columns><Id>20</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>{pre_HedgingDesignationAxis} : Derivates not designated as hedges [Member]
{us-gaap_DerivativeByNatureAxis} : Credit default swaps (assumed risks) [Member]
12/31/2009
USD ($)
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{us-gaap_DerivativeByNatureAxis} : Insurance-linked securities [Member]
12/31/2010
USD ($)
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{us-gaap_DerivativeByNatureAxis} : Insurance-linked securities [Member]
12/31/2009
USD ($)
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{us-gaap_DerivativeByNatureAxis} : Total return swaps [Member]
12/31/2010
USD ($)
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{us-gaap_DerivativeByNatureAxis} : Total return swaps [Member]
12/31/2009
USD ($)
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{us-gaap_DerivativeByNatureAxis} : Interest rate swaps [Member]
12/31/2010
USD ($)
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{us-gaap_DerivativeByNatureAxis} : Interest rate swaps [Member]
12/31/2009
USD ($)
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{us-gaap_DerivativeByNatureAxis} : Other [Member]
12/31/2010
USD ($)
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{us-gaap_DerivativeByNatureAxis} : Other [Member]
12/31/2009
USD ($)
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These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</ElementDefenition><IsTotalLabel>false</IsTotalLabel><IsEPS>false</IsEPS><Label>Derivative [Line Items]</Label></Row><Row><Id>52</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><Level>0</Level><ElementName>invest_DerivativeNotionalAmount</ElementName><ElementPrefix>invest</ElementPrefix><IsBaseElement>false</IsBaseElement><BalanceType>na</BalanceType><PeriodType>instant</PeriodType><ShortDefinition>No definition available.</ShortDefinition><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsSubReportEnd>false</IsSubReportEnd><IsCalendarTitle>false</IsCalendarTitle><IsTuple>false</IsTuple><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole /><FootnoteIndexer /><Cells><Cell><Id>1</Id><IsNumeric>true</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><NonNumericTextHeader /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell><Cell><Id>2</Id><IsNumeric>true</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><NonNumericTextHeader /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Monetary</Unit><ElementDataType>xbrli:monetaryItemType</ElementDataType><SimpleDataType>monetary</SimpleDataType><ElementDefenition>Total monetary amount specified by the derivative(s). 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