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v3.25.3

Segment Information (Details) | 9 Months Ended
--- | ---
Sep. 30, 2025
Segment Information |
Number of reportable segments not disclosed | true

X
- Definition Indicates whether any of the number of reportable segments not disclosed. + References No definition available. + Details
Name: | pfg_NumberOfReportableSegmentsNotDisclosedFlag
Namespace Prefix: | pfg_
Data Type: | xbrli:booleanItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration