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 -Name Regulation 12B
 -Number 240
 -Section 12b
 -Subsection 1

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 -Publisher SEC
 -Name Regulation 12B
 -Number 240
 -Section 12b
 -Subsection 1

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3/1/2011 - 3/1/2011
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{dei_LegalEntityAxis} : S000006991 Member
{rr_ProspectusShareClassAxis} : C000019044 Member
3/1/2011 - 3/1/2011
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3/1/2011 - 3/1/2011
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3/1/2011 - 3/1/2011
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{dei_LegalEntityAxis} : S000007123 Member
{rr_ProspectusShareClassAxis} : C000019468 Member
3/1/2011 - 3/1/2011
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{dei_LegalEntityAxis} : S000007123 Member
{rr_ProspectusShareClassAxis} : C000019470 Member
3/1/2011 - 3/1/2011
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{rr_ProspectusShareClassAxis} : C000019469 Member
3/1/2011 - 3/1/2011
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3/1/2011 - 3/1/2011
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{rr_ProspectusShareClassAxis} : C000019700 Member
3/1/2011 - 3/1/2011
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/><Cells><Cell><Id>1</Id><IsNumeric>false</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><Columns><Id>154</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode /><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>{dei_DocumentInformationDocumentAxis} : SummaryS000007201 Member
{dei_LegalEntityAxis} : S000007201 Member
{rr_ProspectusShareClassAxis} : C000019701 Member
3/1/2011 - 3/1/2011
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/><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns><Columns><Id>155</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode /><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>{dei_DocumentInformationDocumentAxis} : SummaryS000007201 Member
{dei_LegalEntityAxis} : S000007201 Member
{rr_ProspectusShareClassAxis} : C000019703 Member
3/1/2011 - 3/1/2011
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/><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns><Columns><Id>156</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode /><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>{dei_DocumentInformationDocumentAxis} : SummaryS000007201 Member
{dei_LegalEntityAxis} : S000007201 Member
{rr_ProspectusShareClassAxis} : C000019702 Member
3/1/2011 - 3/1/2011
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3/1/2011 - 3/1/2011
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3/1/2011 - 3/1/2011
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3/1/2011 - 3/1/2011
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3/1/2011 - 3/1/2011
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3/1/2011 - 3/1/2011
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{rr_ProspectusShareClassAxis} : C000090498 Member
3/1/2011 - 3/1/2011
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{dei_LegalEntityAxis} : S000006952 Member
{rr_ProspectusShareClassAxis} : C000018956 Member
3/1/2011 - 3/1/2011
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/><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Bond &amp; Mortgage Securities Fund</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>ck0000898745_S000006952Member</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Bond &amp; Mortgage Securities Fund - R-1</ValueName><ValueType>rr_ProspectusShareClassAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>ck0000898745_C000018956Member</Id><dimensionId>rr_ProspectusShareClassAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode /><OriginalCurrencyCode /></MCU><CurrencySymbol /><Labels><Label Id="1" Label="Bond &amp; Mortgage 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available.</ShortDefinition><IsReportTitle>false</IsReportTitle><IsSegmentTitle>true</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>http://www.principal.com/role/documentdocumentandentityinformation</PreferredLabelRole><FootnoteIndexer /><Cells><Cell><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><NonNumericTextHeader /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol 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{dei_LegalEntityAxis} : S000006952 Member
{rr_ProspectusShareClassAxis} : C000018957 Member
3/1/2011 - 3/1/2011
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/></contextRef><UPS><UnitProperty><UnitID>pure</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema><MeasureValue>pure</MeasureValue><MeasureNamespace /></StandardMeasure><Scale>0</Scale></UnitProperty></UPS><CurrencyCode /><OriginalCurrencyCode /></MCU><CurrencySymbol /><Labels><Label Id="1" Label="Bond &amp; Mortgage Securities Fund (Prospectus Summary)" /><Label Id="2" Label="Bond &amp; Mortgage Securities Fund" /><Label Id="3" Label="Bond &amp; Mortgage Securities Fund - R-2" /><Label Id="4" Label="3/1/2011 - 3/1/2011" /></Labels></Columns></OriginalInstanceReportColumns><Unit>Other</Unit><ElementDataType /><SimpleDataType>na</SimpleDataType><ElementDefenition>No definition available.</ElementDefenition><ElementReferences>No authoritative reference available.</ElementReferences><IsTotalLabel>false</IsTotalLabel><IsEPS>false</IsEPS><Label>Bond &amp; Mortgage Securities Fund (Prospectus Summary) | Bond &amp; Mortgage 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/><Cells><Cell><Id>1</Id><IsNumeric>false</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><Columns><Id>239</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode /><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>{dei_DocumentInformationDocumentAxis} : SummaryS000006952 Member
{dei_LegalEntityAxis} : S000006952 Member
{rr_ProspectusShareClassAxis} : C000018958 Member
3/1/2011 - 3/1/2011
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3/1/2011 - 3/1/2011
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