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Separate Account Balances (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Separate Account Balances
Separate account that primarily includes shares of Principal Financial Group, Inc. stock that were allocated and issued to eligible participants of qualified employee benefit plans as part of the 2001 demutualization	$ 78.9	$ 79.8

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- Definition

This item represents the value of a separate account that primarily includes shares of Principal Financial Group, Inc. stock that were allocated and issued to eligible participants of qualified employee benefit plans administered as part of the policy credits issued under the 2001 demutualization.

+ References

No definition available.

+ Details

Name:	pfg_SeparateAccountWithSharesOfPrincipalFinancialGroupStock
Namespace Prefix:	pfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_SeparateAccountsDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration