3.26.1 html 189 82 1 false 60 0 false 4 false false R1.htm 00090 - Document - Document and Entity Information Sheet http://principal.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 00100 - Statement - Statements of Net Assets Available for Benefits Sheet http://principal.com/role/StatementStatementsOfNetAssetsAvailableForBenefits Statements of Net Assets Available for Benefits Statements 2 false false R3.htm 00200 - Statement - Statement of Changes in Net Assets Available for Benefits Sheet http://principal.com/role/StatementStatementOfChangesInNetAssetsAvailableForBenefits Statement of Changes in Net Assets Available for Benefits Statements 3 false false R4.htm 10101 - Disclosure - Description of the Plan Sheet http://principal.com/role/DisclosureDescriptionOfPlan Description of the Plan Notes 4 false false R5.htm 10201 - Disclosure - Significant Accounting Policies Sheet http://principal.com/role/DisclosureSignificantAccountingPolicies Significant Accounting Policies Notes 5 false false R6.htm 10301 - Disclosure - Income Tax Status Sheet http://principal.com/role/DisclosureIncomeTaxStatus Income Tax Status Notes 6 false false R7.htm 10401 - Disclosure - Fair Value of Financial Instruments (excluding PSSVSA) Sheet http://principal.com/role/DisclosureFairValueOfFinancialInstrumentsExcludingPssvsa Fair Value of Financial Instruments (excluding PSSVSA) Notes 7 false false R8.htm 10501 - Disclosure - Interest in PSSVSA Sheet http://principal.com/role/DisclosureInterestInPssvsa Interest in PSSVSA Notes 8 false false R9.htm 10601 - Disclosure - Related Party Transactions Sheet http://principal.com/role/DisclosureRelatedPartyTransactions Related Party Transactions Notes 9 false false R10.htm 10701 - Disclosure - Form 5500 Sheet http://principal.com/role/DisclosureForm5500 Form 5500 Notes 10 false false R11.htm 10801 - Disclosure - Schedule H, Line 4i - Schedule of Assets Sheet http://principal.com/role/DisclosureScheduleHLine4iScheduleOfAssets Schedule H, Line 4i - Schedule of Assets Notes 11 false false R12.htm 20202 - Disclosure - Significant Accounting Policies (Policies) Sheet http://principal.com/role/DisclosureSignificantAccountingPoliciesPolicies Significant Accounting Policies (Policies) Policies http://principal.com/role/DisclosureSignificantAccountingPolicies 12 false false R13.htm 30103 - Disclosure - Disclosure - Description of the Plan (Tables) Sheet http://principal.com/role/DisclosureDisclosureDescriptionOfPlanTables Disclosure - Description of the Plan (Tables) Tables 13 false false R14.htm 30403 - Disclosure - Fair Value of Financial Instruments (excluding PSSVSA) (Tables) Sheet http://principal.com/role/DisclosureFairValueOfFinancialInstrumentsExcludingPssvsaTables Fair Value of Financial Instruments (excluding PSSVSA) (Tables) Tables http://principal.com/role/DisclosureFairValueOfFinancialInstrumentsExcludingPssvsa 14 false false R15.htm 30503 - Disclosure - Interest in PSSVSA (Tables) Sheet http://principal.com/role/DisclosureInterestInPssvsaTables Interest in PSSVSA (Tables) Tables http://principal.com/role/DisclosureInterestInPssvsa 15 false false R16.htm 30703 - Disclosure - Form 5500 (Tables) Sheet http://principal.com/role/DisclosureForm5500Tables Form 5500 (Tables) Tables http://principal.com/role/DisclosureForm5500 16 false false R17.htm 40101 - Disclosure - Description of the Plan - Contributions (Details) Sheet http://principal.com/role/DisclosureDescriptionOfPlanContributionsDetails Description of the Plan - Contributions (Details) Details 17 false false R18.htm 40102 - Disclosure - Description of the Plan - Vesting (Details) Sheet http://principal.com/role/DisclosureDescriptionOfPlanVestingDetails Description of the Plan - Vesting (Details) Details 18 false false R19.htm 40103 - Disclosure - Description of the Plan - Forfeitures (Details) Sheet http://principal.com/role/DisclosureDescriptionOfPlanForfeituresDetails Description of the Plan - Forfeitures (Details) Details 19 false false R20.htm 40104 - Disclosure - Description of the Plan - Participant Loans (Details) Sheet http://principal.com/role/DisclosureDescriptionOfPlanParticipantLoansDetails Description of the Plan - Participant Loans (Details) Details 20 false false R21.htm 40301 - Disclosure - Income Tax Status (Details) Sheet http://principal.com/role/DisclosureIncomeTaxStatusDetails Income Tax Status (Details) Details http://principal.com/role/DisclosureIncomeTaxStatus 21 false false R22.htm 40401 - Disclosure - Fair Value of Financial Instruments (excluding PSSVSA) - Valuation Hierarchy (Details) Sheet http://principal.com/role/DisclosureFairValueOfFinancialInstrumentsExcludingPssvsaValuationHierarchyDetails Fair Value of Financial Instruments (excluding PSSVSA) - Valuation Hierarchy (Details) Details http://principal.com/role/DisclosureFairValueOfFinancialInstrumentsExcludingPssvsaTables 22 false false R23.htm 40402 - Disclosure - Fair Value of Financial Instruments (excluding PSSVSA) - Determination of Fair Value (Details) Sheet http://principal.com/role/DisclosureFairValueOfFinancialInstrumentsExcludingPssvsaDeterminationOfFairValueDetails Fair Value of Financial Instruments (excluding PSSVSA) - Determination of Fair Value (Details) Details http://principal.com/role/DisclosureFairValueOfFinancialInstrumentsExcludingPssvsaTables 23 false false R24.htm 40403 - Disclosure - Fair Value of Financial Instruments (excluding PSSVSA) - Assets Measured at Fair Value on a Recurring Basis (Details) Sheet http://principal.com/role/DisclosureFairValueOfFinancialInstrumentsExcludingPssvsaAssetsMeasuredAtFairValueOnRecurringBasisDetails Fair Value of Financial Instruments (excluding PSSVSA) - Assets Measured at Fair Value on a Recurring Basis (Details) Details http://principal.com/role/DisclosureFairValueOfFinancialInstrumentsExcludingPssvsaTables 24 false false R25.htm 40404 - Disclosure - Fair Value of Financial Instruments (excluding PSSVSA) - Changes in Level 3 Fair Value Measurements (Details) Sheet http://principal.com/role/DisclosureFairValueOfFinancialInstrumentsExcludingPssvsaChangesInLevel3FairValueMeasurementsDetails Fair Value of Financial Instruments (excluding PSSVSA) - Changes in Level 3 Fair Value Measurements (Details) Details http://principal.com/role/DisclosureFairValueOfFinancialInstrumentsExcludingPssvsaTables 25 false false R26.htm 40405 - Disclosure - Fair Value of Financial Instruments (excluding PSSVSA) - Quantitative Information about Level 3 Fair Value Measurements (Details) Sheet http://principal.com/role/DisclosureFairValueOfFinancialInstrumentsExcludingPssvsaQuantitativeInformationAboutLevel3FairValueMeasurementsDetails Fair Value of Financial Instruments (excluding PSSVSA) - Quantitative Information about Level 3 Fair Value Measurements (Details) Details http://principal.com/role/DisclosureFairValueOfFinancialInstrumentsExcludingPssvsaTables 26 false false R27.htm 40501 - Disclosure - Interest in PSSVSA (Details) Sheet http://principal.com/role/DisclosureInterestInPssvsaDetails Interest in PSSVSA (Details) Details http://principal.com/role/DisclosureInterestInPssvsaTables 27 false false R28.htm 40502 - Disclosure - Interest in PSSVSA - Net assets (Details) Sheet http://principal.com/role/DisclosureInterestInPssvsaNetAssetsDetails Interest in PSSVSA - Net assets (Details) Details 28 false false R29.htm 40601 - Disclosure - Related Party Transactions (Details) Sheet http://principal.com/role/DisclosureRelatedPartyTransactionsDetails Related Party Transactions (Details) Details http://principal.com/role/DisclosureRelatedPartyTransactions 29 false false R30.htm 40701 - Disclosure - Form 5500 - Reconciliation of Net Assets Available for Benefits per the Statements of Net Assets Available for Benefits to the Form 5500 (Details) Sheet http://principal.com/role/DisclosureForm5500ReconciliationOfNetAssetsAvailableForBenefitsPerStatementsOfNetAssetsAvailableForBenefitsToForm5500Details Form 5500 - Reconciliation of Net Assets Available for Benefits per the Statements of Net Assets Available for Benefits to the Form 5500 (Details) Details 30 false false R31.htm 40702 - Disclosure - Form 5500 - Reconciliation of Statement of Changes in Net Assets Available for Benefits to the Form 5500 (Details) Sheet http://principal.com/role/DisclosureForm5500ReconciliationOfStatementOfChangesInNetAssetsAvailableForBenefitsToForm5500Details Form 5500 - Reconciliation of Statement of Changes in Net Assets Available for Benefits to the Form 5500 (Details) Details 31 false false R32.htm 40801 - Disclosure - Schedule H, Line 4i - Schedule of Assets (Details) Sheet http://principal.com/role/DisclosureScheduleHLine4iScheduleOfAssetsDetails Schedule H, Line 4i - Schedule of Assets (Details) Details http://principal.com/role/DisclosureScheduleHLine4iScheduleOfAssets 32 false false All Reports Book All Reports pfg-20251231.xsd pfg-20251231_cal.xml pfg-20251231_def.xml pfg-20251231_lab.xml pfg-20251231_pre.xml pfg-20251231x11k.htm pfg-20251231x11k001.jpg pfg-20251231x11k002.jpg http://fasb.org/us-gaap-ebp/2026 http://xbrl.sec.gov/dei/2026 true true