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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Reclassification adjustment for (gains) losses on available-for-sale securities included in net income42false 3pfg_AdjustmentsForAssumedChangesInAmortizationPatternsAvailableForSaleSecuritiesNetOfTaxpfg_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse109300000109.3falsefalsefalse2truefalsefalse-15700000-15.7falsefalsefalse3truefalsefalse137700000137.7falsefalsefalse4truefalsefalse-51800000-51.8falsefalsefalsexbrli:monetaryItemTypemonetaryChange in accumulated gains and losses associated with amortization of deferred acquisition costs and other actuarial balances such as sales inducements and unearned revenue related to available-for-sale securities.No definition available.false2Adjustments for assumed changes in amortization patterns related to available-for-sale securities43false 3pfg_AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsNetOfTaxpfg_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse380500000380.5falsefalsefalse2truefalsefalse-112800000-112.8falsefalsefalse3truefalsefalse316700000316.7falsefalsefalse4truefalsefalse-142900000-142.9falsefalsefalsexbrli:monetaryItemTypemonetaryIncludes various assumed changes in policyholder liabilities related to available-for-sale securities, including the amount by which the liability for policyholder benefits and claims would change if all unrealized gains/losses for the period were realized and changes in the policyholder dividend obligation, net of tax.No definition available.false2Adjustments for assumed changes in policyholder liabilities related to available-for-sale securities44false 3pfg_OtherComprehensiveIncomeAvailableForSaleSecuritiesPeriodIncreaseDecreaseNetOfTaxpfg_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-453700000-453.7falsefalsefalse2truefalsefalse100700000100.7falsefalsefalse3truefalsefalse-553000000-553.0falsefalsefalse4truefalsefalse262000000262.0falsefalsefalsexbrli:monetaryItemTypemonetaryNet unrealized gains/losses on fixed maturities and equity securities available-for-sale net of adjustments related to deferred acquisition costs, sales inducements, unearned revenue reserves, changes in policyholder benefits and claims and applicable income taxes.No definition available.true2Net unrealized gains (losses) on available-for-sale securities45false 3us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecuritiesus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse18000001.8falsefalsefalse2truefalsefalse-11000000-11.0falsefalsefalse3truefalsefalse-11300000-11.3falsefalsefalse4truefalsefalse-14300000-14.3falsefalsefalsexbrli:monetaryItemTypemonetaryAmount after tax of other than temporary impairment (OTTI) loss on a debt security, categorized as available-for-sale. 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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Noncredit component of impairment losses on fixed maturities, available-for-sale during the period46false 3pfg_AdjustmentsForAssumedChangesInAmortizationPatternsNoncreditImpairmentLossesNetOfTaxpfg_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-900000-0.9falsefalsefalse2truefalsefalse11000001.1falsefalsefalse3truefalsefalse1000000.1falsefalsefalse4truefalsefalse35000003.5falsefalsefalsexbrli:monetaryItemTypemonetaryChange in accumulated gains and losses associated with amortization of deferred acquisition costs and other actuarial balances such as sales inducements and unearned revenue related to noncredit component of impairment losses on available-for-sale debt securities.No definition available.false2Adjustments for assumed changes in amortization patterns related to noncredit component of impairment losses on fixed maturities, available-for-sale47false 3pfg_AdjustmentsForAssumedChangesInPolicyholderLiabilitiesOtherThanTemporaryImpairmentLossesNetOfTaxpfg_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-200000-0.2falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse6000000.6falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryIncludes various assumed changes in policyholder liabilities related to noncredit portion of impairment losses on available-for-sale debt securities, including the amount by which the liability for policyholder benefits and claims would change if all unrealized gains/losses for the period were realized.No definition available.false2Adjustments for assumed changes in policyholder liabilities related to noncredit component of impairment losses on fixed maturities, available-for-sale48false 3pfg_OtherComprehensiveIncomeReclassificationAdjustmentNetOfTaxpfg_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedTotalLabel1truefalsefalse7000000.7falsefalsefalse2truefalsefalse-9900000-9.9falsefalsefalse3truefalsefalse-10600000-10.6falsefalsefalse4truefalsefalse-10800000-10.8falsefalsefalsexbrli:monetaryItemTypemonetaryNoncredit portion of impairment losses on debt securities for the period that meet the criteria to have impairment losses bifurcated between net income (credit losses) and OCI (noncredit losses), net of related taxes and assumed changes in amortization patterns.No definition available.true2Noncredit component of impairment losses on fixed maturities, available-for-sale49false 3us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTaxus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-12000000-12.0falsefalsefalse2truefalsefalse4770000047.7falsefalsefalse3truefalsefalse98000009.8falsefalsefalse4truefalsefalse1920000019.2falsefalsefalsexbrli:monetaryItemTypemonetaryNet of tax amount, before reclassification adjustments, of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. 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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Net unrealized gains (losses) on derivative instruments during the period50false 3us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTaxus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse1000000.1falsefalsefalse2truefalsefalse5000000.5falsefalsefalse3truefalsefalse-300000-0.3falsefalsefalse4truefalsefalse68000006.8falsefalsefalsexbrli:monetaryItemTypemonetaryNet of tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. 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Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32022-110900 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a-c) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 false2Foreign currency translation adjustment55false 3pfg_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansPriorServiceCostAndNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTaxpfg_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse1380000013.8falsefalsefalse2truefalsefalse88000008.8falsefalsefalse3truefalsefalse2760000027.6falsefalsefalse4truefalsefalse1750000017.5falsefalsefalsexbrli:monetaryItemTypemonetaryThe adjustment out of other comprehensive income for (1) prior service costs and (2) actuarial gains or losses that have been recognized as a component of net periodic benefit cost during the period, after tax.No definition available.false2Amortization of prior service (benefit) cost and actuarial (gain) loss included in net periodic benefit cost56false 3us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTaxus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedTotalLabel1truefalsefalse1380000013.8falsefalsefalse2truefalsefalse88000008.8falsefalsefalse3truefalsefalse2760000027.6falsefalsefalse4truefalsefalse1750000017.5falsefalsefalsexbrli:monetaryItemTypemonetaryNet of tax and reclassifications amount of pension and other postretirement benefit plans (gain) loss included in accumulated other comprehensive income (loss).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 true2Net unrecognized postretirement benefit obligation57false 3us-gaap_OtherComprehensiveIncomeLossNetOfTaxus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-629900000-629.9USD$falsetruefalse2truefalsefalse6500000065.0USD$falsetruefalse3truefalsefalse-650300000-650.3USD$falsetruefalse4truefalsefalse290200000290.2USD$falsetruefalsexbrli:monetaryItemTypemonetaryNet of tax amount of other comprehensive income (loss) attributable to both parent entity and noncontrolling interest.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669619-108580 true2Other comprehensive income (loss)falseStockholders' Equity (Details 2) (USD $)HundredThousandsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://principal.com/role/DisclosureStockholdersEquityDetails2457