Document and Entity Information Document Information [Table] Legal Entity [Axis] Entity [Domain] Represents the entity's Employee Benefit Plan No. 003. E B P 003 [Member] EBP 003 Document Information [Line Items] Document and Entity Information Document Type Entity Registrant Name Entity Central Index Key Amendment Flag Statements of Net Assets Available for Benefits EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] Statements of Net Assets Available for Benefits EBP, Asset [Abstract] Assets EBP, Investment, Fair Value [Abstract] Investments at fair value: EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Ending Asset Balance Beginning Asset Balance Investments, at fair value Total invested assets, excluding Plan interest in Principal Select Stable Value Separate Account EBP, Investment, Plan Interest in Master Trust, Contract Value Investments, at contract value EBP, Investment, Fair and Contract Value Total investments EBP, Receivable [Abstract] Receivables: EBP, Employer Contribution, Receivable Contributions receivable from employer EBP, Note Receivable from Participant Notes receivable from participants EBP, Other Receivable Other receivables EBP, Receivable Total receivables EBP, Net Asset Available for Benefit Net assets available for benefits at end of year Net assets available for benefits at beginning of year Net assets available for benefits per the Statements of Net Assets Available for Benefits Net assets available for benefits EBP, Statement of Change in Net Asset Available for Benefit [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] Statement of Changes in Net Assets Available for Benefits EBP, Change in Net Asset Available for Benefit, Increase [Abstract] Additions EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment [Abstract] Investment income: EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Investment Interest EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Dividends EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment Net appreciation of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Investment Income (Loss), before Investment Expense Total investment gain EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Interest income on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Employer EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution Participants EBP, Change in Net Asset Available for Benefit, Increase from Contribution Total contributions EBP, Change in Net Asset Available for Benefit, Increase Total additions EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Deductions EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease Total deductions EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Net increase in net assets available for benefits per the financial statements Net increase Description of the Plan EBP, Description of Plan [Table] EBP, Description of Plan [Line Items] Description of the Plan EBP, Description of Plan [Text Block] Description of the Plan Significant Accounting Policies EBP, Accounting Policy [Table] EBP, Accounting Policy [Line Items] Significant Accounting Policies EBP, Summary of Accounting Policy [Text Block] Significant Accounting Policies Income Tax Status EBP, Tax Status [Table] EBP, Tax Status [Line Items] Income Tax Status EBP, Tax Status [Text Block] Income Tax Status Fair Value of Financial Instruments (excluding PSSVSA) EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Line Items] Fair Value of Financial Instruments (excluding PSSVSA) EBP, Investment, Fair Value and NAV [Text Block] Fair Value of Financial Instruments (excluding PSSVSA) Interest in PSSVSA EBP, Master Trust [Table] EBP, Master Trust [Line Items] Interest in PSSVSA EBP, Master Trust [Text Block] Interest in PSSVSA Related Party Transactions EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Line Items] Related Party Transactions EBP, Related Party and Party-in-Interest Transactions [Text Block] Related Party Transactions Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] Form 5500 Schedule H, Line 4i - Schedule of Assets EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Line Items] Schedule H, Line 4i - Schedule of Assets EBP, Schedule of Asset Held for Investment [Table Text Block] Schedule H, Line 4i - Schedule of Assets EBP, Basis of Accounting [Policy Text Block] Basis of Accounting EBP, Investment [Policy Text Block] Valuation of Investments and Income Recognition EBP, Note Receivable from Participant [Policy Text Block] Notes Receivable From Participants EBP, Payment to Participant [Policy Text Block] Payment of Benefits EBP, Risk and Uncertainty [Policy Text Block] Risks and Uncertainties EBP, Use of Estimate [Policy Text Block] Use of Estimates Tabular disclosure of loan rates by participant loan dates. Employee Benefit Plan, Schedule of Loan Rates By Date [Table Text Block] Schedule of loan rates by participant loan dates EBP, Investment, Fair Value and NAV [Table Text Block] Summary of assets measured at fair value on a recurring basis Tabular disclosure of effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets of pension plans and/or other employee benefit plans for the period. Employee Benefit Plan, Investment, Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] Schedule of reconciliation for all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3). This disclosure may include, but is not limited to, the fair value of the asset or liability, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of inputs, and the weighted averages of the inputs. Quantitative Information Level 3 Fair Value Measurements [Table Text Block] Summary of quantitative information about the significant unobservable inputs used for recurring fair value measurements categorized within Level 3 Tabular disclosure of net assets for master trust arrangement (MTIA) in which employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) participates. Employee Benefit Plan Master Trust, Net Assets [Table Text Block] Schedule of net assets, including investments, of the MTIA EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] Schedule of reconciles net assets available for benefits per the Statements of Net Assets Available for Benefits to the Form 5500 EBP, Related Party and Party-in-Interest [Axis] EBP, Related Party and Party-in-Interest [Domain] Defined contribution participants who elected to retain the prior benefit provisions and forgo receipt of the additional matching contributions. These participants are referred to as "Grandfathered Choice Participants". Employee Benefit Plan, Grandfathered Choice Participants [Member] Grandfathered Choice Participants Minimum attained age of retirement program participants to elect to retain prior benefit provisions under the qualified defined benefit retirement plan and forgo receipt of the additional benefits offered by amendments to a retirement plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Employee Benefit Plan, Minimum Attained Age To Elect To Retain Benefits Prior to Amendment Minimum age to elect to retain period benefit provisions Minimum attained service period a participant is required to elect to retain prior benefit provisions under the qualified defined benefit retirement plan and forgo receipt of the additional benefits offered by amendments to a retirement plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Employee Benefit Plan, Minimum Attained Service To Elect To Retain Benefits Prior to Amendment Minimum years of service to elect to retain period benefit provisions EBP, Employer Contribution, Matching Percentage Contribution rate of employer to match participant's contributions (as a percent) EBP, Employer Contribution, Participant Compensation Matched, Percentage Maximum percent of participant's compensation matched by employer (as a percent) Percentage of vesting employer matching contribution to eligible participant contribution to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) after vesting period. Employee Benefit Plan, Vesting Percentage Vesting percentage after three years Period over which participants' ownership of employer contributions to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. Employee Benefit Plan, Vesting Period Vesting period EBP, Forfeited Nonvested Account Forfeited non-vested account balances EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Employer contributions reduction from forfeited non-vested accounts Information by date or year participant loans. Employee Benefit Plan, Participant Loan Date [Axis] Date or year of participant loan is approved. Employee Benefit Plan, Participant Loan Date [Domain] Employee Benefit Plan, January 1, 2013 to December 16, 2015 [Member] Employee Benefit Plan, January 1, 2013 to December 16, 2015 [Member] January 1, 2013 to December 16, 2015 Employee Benefit Plan, December 17, 2015 to December 14, 2016 [Member] Employee Benefit Plan, December 17, 2015 to December 14, 2016 [Member] December 17, 2015 to December 14, 2016 Employee Benefit Plan, December 15, 2016 to March 21, 2017 [Member] Employee Benefit Plan, December 15, 2016 to March 21, 2017 [Member] December 15, 2016 to March 21, 2017 Employee Benefit Plan, March 22, 2017 to June 20, 2017 [Member] Employee Benefit Plan, March 22, 2017 to June 20, 2017 [Member] March 22, 2017 to June 20, 2017 Employee Benefit Plan, June 21, 2017 to December 19, 2017 [Member] Employee Benefit Plan, June 21, 2017 to December 19, 2017 [Member] June 21, 2017 to December 19, 2017 Employee Benefit Plan, December 20, 2017 to March 27, 2018 [Member] Employee Benefit Plan, December 20, 2017 to March 27, 2018 [Member] December 20, 2017 to March 27, 2018 Employee Benefit Plan, March 28, 2018 to June 19, 2018 [Member] Employee Benefit Plan, March 28, 2018 to June 19, 2018 [Member] March 28, 2018 to June 19, 2018 Employee Benefit Plan, June 20, 2018 to October 2, 2018 [Member] Employee Benefit Plan, June 20, 2018 to October 2, 2018 [Member] June 20, 2018 to October 2, 2018 Employee Benefit Plan, October 3, 2018 to December 25, 2018 [Member] Employee Benefit Plan, October 3, 2018 to December 25, 2018 [Member] October 3, 2018 to December 25, 2018 Employee Benefit Plan, December 26, 2018 to August 6, 2019 [Member] Employee Benefit Plan, December 26, 2018 to August 6, 2019 [Member] December 26, 2018 to August 6, 2019 Employee Benefit Plan, August 7, 2019 to September 24, 2019 [Member] Employee Benefit Plan, August 7, 2019 to September 24, 2019 [Member] August 7, 2019 to September 24, 2019 Employee Benefit Plan, September 25, 2019 to November 5, 2019 [Member] Employee Benefit Plan, September 25, 2019 to November 5, 2019 [Member] September 25, 2019 to November 5, 2019 Employee Benefit Plan, November 6, 2019 to March 3, 2020 [Member] Employee Benefit Plan, November 6, 2019 to March 3, 2020 [Member] November 6, 2019 to March 3, 2020 Employee Benefit Plan, March 4, 2020 to March 10, 2020 [Member] Employee Benefit Plan, March 4, 2020 to March 10, 2020 [Member] March 4, 2020 to March 10, 2020 Employee Benefit Plan, March 11, 2020 to March 17, 2020 [Member] Employee Benefit Plan, March 11, 2020 to March 17, 2020 [Member] March 11, 2020 to March 17, 2020 Employee Benefit Plan, March 18, 2020 to March 24, 2020 [Member] Employee Benefit Plan, March 18, 2020 to March 24, 2020 [Member] March 18, 2020 to March 24, 2020 Employee Benefit Plan, March 25, 2020 to March 22, 2022 [Member] Employee Benefit Plan, March 25, 2020 to March 22, 2022 [Member] March 25, 2020 to March 22, 2022 Employee Benefit Plan, March 23, 2022 to May 10, 2022 [Member] Employee Benefit Plan, March 23, 2022 to May 10, 2022 [Member] March 23, 2022 to May 10, 2022 Employee Benefit Plan, May 11, 2022 to June 21, 2022 [Member] Employee Benefit Plan, May 11, 2022 to June 21, 2022 [Member] May 11, 2022 to June 21, 2022 Employee Benefit Plan, June 22, 2022 to August 2, 2022 [Member] Employee Benefit Plan, June 22, 2022 to August 2, 2022 [Member] June 22, 2022 to August 2, 2022 Employee Benefit Plan, August 3, 2022 to September 27, 2022 [Member] Employee Benefit Plan, August 3, 2022 to September 27, 2022 [Member] August 3, 2022 to September 27, 2022 Employee Benefit Plan, September 28, 2022 to November 8, 2022 [Member] Employee Benefit Plan, September 28, 2022 to November 8, 2022 [Member] September 28, 2022 to November 8, 2022 Employee Benefit Plan, November 9, 2022 to December 20, 2022 [Member] Employee Benefit Plan, November 9, 2022 to December 20, 2022 [Member] November 9, 2022 to December 20, 2022 Employee Benefit Plan, December 21, 2022 to February 7, 2023 [Member] Employee Benefit Plan, December 21, 2022 to February 7, 2023 [Member] December 21, 2022 to February 7, 2023 Employee Benefit Plan, February 8, 2023 to March 28, 2023 [Member] Employee Benefit Plan, February 8, 2023 to March 28, 2023 [Member] February 8, 2023 to March 28, 2023 Employee Benefit Plan, March 29, 2023 to May 9, 2023 [Member] Employee Benefit Plan, March 29, 2023 to May 9, 2023 [Member] March 29, 2023 to May 9, 2023 Employee Benefit Plan, May 10, 2023 to August 1, 2023 [Member] Employee Benefit Plan, May 10, 2023 to August 1, 2023 [Member] May 10, 2023 to August 1, 2023 Employee Benefit Plan, August 2, 2023 to September 24, 2024 [Member] Employee Benefit Plan, August 2, 2023 to September 24, 2024 [Member] August 2, 2023 to September 24, 2024 Employee Benefit Plan, September 25, 2024 to November 12, 2024 [Member] Employee Benefit Plan, September 25, 2024 to November 12, 2024 [Member] September 25, 2024 to November 12, 2024 Employee Benefit Plan, November 13, 2024 to November 19, 2024 [Member] Employee Benefit Plan, November 13, 2024 to November 19, 2024 [Member] November 13, 2024 to November 19, 2024 Employee Benefit Plan, November 20, 2024 to December 24, 2024 [Member] Employee Benefit Plan, November 20, 2024 to December 24, 2024 [Member] November 20, 2024 to December 24, 2024 Employee Benefit Plan, December 25, 2024 to September 16, 2025 [Member] Employee Benefit Plan, December 25, 2024 to September 16, 2025 [Member] December 25, 2024 to September 16, 2025 Employee Benefit Plan, September 17, 2025 to September 23, 2025 [Member] Employee Benefit Plan, September 17, 2025 to September 23, 2025 [Member] September 17, 2025 to September 23, 2025 Employee Benefit Plan, September 24, 2025 to November 4, 2025 [Member] Employee Benefit Plan, September 24, 2025 to November 4, 2025 [Member] September 24, 2025 to November 4, 2025 Employee Benefit Plan, November 5, 2025 to December 16, 2025 [Member] Employee Benefit Plan, November 5, 2025 to December 16, 2025 [Member] November 5, 2025 to December 16, 2025 Employee Benefit Plan, December 17, 2025 to December 31, 2025 [Member] Employee Benefit Plan, December 17, 2025 to December 31, 2025 [Member] December 17, 2025 to December 31, 2025 Percentage points added to the reference rate to compute the variable rate on the participant loans. Employee Benefit Plan, Participants Loans, Basis Spread on Variable Rate Interest rate spread over Federal Reserve "Bank Prime Rate" EBP, Asset Held for Investment, Participant Loan, Interest Rate Rate Interest rate EBP, Tax Determination Letter, Date Date of IRS Determination letter EBP, Tax Determination Letter, Obtained [true false] EBP, Tax Qualification Status [Extensible Enumeration] The amounts transferred between levels of the fair value hierarchy of investments. Employee Benefit Plan Investment, Investments, Transfers Between Fair Value Levels Transfers between levels Investment Type [Axis] Investments [Domain] Residential Real Estate [Member] Real estate Number of investment for which the fair value of the underlying real estate is based on unobservable inputs and used to determine the NAV of the separate account. Employee Benefit Plan Investment, Number Of Investment In Separate Account Valued in Unobservable Input Number of investments for which fair value is based on unobservable inputs. Deferred Fixed Annuity [Member] Deferred income annuity Guaranteed Investment Contract [Member] Guaranteed interest accounts Separate account in which employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) participates, excluding separate-separate accounts. Employee Benefit Plan Pooled Separate Account, Excluding Separate-Separate Accounts [Member] Separate accounts Employee Stock Ownership Plan, Common, Shares [Member] Principal Financial Group, Inc. Employee Stock Ownership Plan Regulated trust, responsible for collective investment and reinvestment of asset from employee benefit plan maintained by more than one employer or controlled group, excluding separate-separate accounts. Employee Benefit Plan Common Collective Trust, Excluding Separate-Separate Accounts [Member] Collective investment trusts EBP, Self-Directed Brokerage Account [Member] Self-directed brokerage account Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 1 [Member] Level 1 Fair Value, Inputs, Level 2 [Member] Level 2 Fair Value, Inputs, Level 3 [Member] Level 3 EBP, Investment, Level 3 Reconciliation, Increase (Decrease) from Gain (Loss) Interest EBP, Investment, Level 3 Reconciliation, Increase from Purchase Purchases EBP, Investment, Level 3 Reconciliation, Decrease from Sale Sales EBP, Investment, Level 3 Reconciliation, Increase (Decrease) from Unrealized Gain (Loss) Changes in Unrealized Gains Included in Changes in Net Assets Available for Benefits Relating Positions Still Held Measurement Input Type [Axis] Measurement Input Type [Domain] Measurement input using long duration interest rate to determine present value of future cash flows. Measurement Input, Long Duration Interest Rate [Member] Long duration interest rate Measurement input using interest rate on account to determine present value of future cash flows. Measurement Input, Interest Rate On Account [Member] Interest rate on account Measurement input using Applicable interest rate to determine present value of future cash flows. Measurement Input, Applicable Interest Rate [Member] Applicable interest rate Statistical Measurement [Axis] Statistical Measurement [Domain] Minimum [Member] Minimum Maximum [Member] Maximum Weighted Average [Member] Weighted Average EBP, Investment, Valuation Technique [Extensible Enumeration] EBP, Investment, Measurement Input Input Represents Principal Life Insurance Company. Principal Life Insurance Company [Member] Principal Life Minimum percent of termination of employment of group participants that limits the ability of the Plan to transact at contract value with certain party. Employee Benefit Plan, Limit In Ability to Transact at Contract Value, Participants Termination Percentage of termination of employment of group participants limiting Plan to transact bat contract value (as a percent) Minimum percent of affected plan participants in certain spin off or sale of the sponsor's business entity that limits the ability of the Plan to transact contract value with certain party. Employee Benefit Plan, Limit In Ability to Transact at Contract Value, Participants Affected By Spin Off or Sale Percentage of affected Plan members in spin off or sale limiting Plan to transact at contract value (as a percent) Represents Principal Liquid Asset Separate Account (PLASA). Principal Liquid Asset Separate Account [Member] PLASA Represents Morley Stable Income Bond Funds (Bond Funds). Morley Stable Income Bond Funds [Member] Bond Funds EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Axis] EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Domain] EBP, Nonconsolidated, Plan Interest in Master Trust [Member] EBP, Nonconsolidated, Plan Interest in Master Trust EBP, Investment, Contract Value Total net assets at contract value EBP, Employer, Common Stock [Member] ESOP EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Contract Value to Current Value Adjustment Adjustments from contract value to fair value for fully benefit-responsive investment contract EBP, Form 5500 Caption, Net Assets Net assets available for benefits per the Form 5500 EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase (Decrease) from Contract Value to Current Value Net change from contract value to fair value for fully benefit-responsive investment contract EBP, Form 5500 Caption, Net Income (Loss) Net investment gain from MTIA per the Form 5500 Investment, Identifier [Axis] Entity Tax Identification Number Tax identification number EBP, Plan Number Plan number EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Current Value, Type [Extensible Enumeration] EBP, Investment, Current Value, Type [Extensible Enumeration] EBP, Asset Held for Investment, Party-in-Interest [true false] EBP, Investment, Number of Shares Shares of Principal Financial Group, Inc. ESOP EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Current Value EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Loans to participants current value EBP, Asset Held for Investment Total Current Value