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Employee and Agent Benefits - Plan Information (Details) | 12 Months Ended
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Dec. 31, 2023
Pension benefits |
Defined Benefit Plan Disclosures |
Period of employment used to calculate average annual compensation for the final average pay benefit | 5 years

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- Definition The final average pay benefit is based on the years of service and generally the employee's or agent's average annual compensation during the most recent years of employment for this time period. + References No definition available. + Details
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Namespace Prefix: | pfg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |