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Nature of Operations and Significant Accounting Policies - Separate Accounts (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Separate Accounts |  |
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 | $ 55.8 | $ 100.4

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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