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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