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Subsequent Event (Details) - USD ($) $ in Billions		1 Months Ended
	Jan. 31, 2022	Jan. 31, 2022	Dec. 31, 2021
Subsequent Event [Line Items]
Share repurchase program, remaining available amount under June 2021 plan (in dollars)			$ 1.1
Subsequent Event
Subsequent Event [Line Items]
Share repurchase program, maximum authorized amount (in dollars)		$ 1.6
Subsequent Event | Master Transaction Agreement ("Reinsurance Transaction") | Reinsurance | Sutton Cayman, Ltd.
Subsequent Event [Line Items]
Reinsured percentage	100.00%
Subsequent Event | Master Transaction Agreement ("Reinsurance Transaction") | Coinsurance With Funds Withheld | Sutton Cayman, Ltd.
Subsequent Event [Line Items]
Reinsured percentage	100.00%

X

- Definition

This element represents the remaining available balance in the amount authorized for share repurchase by the board of directors.

+ References

No definition available.

+ Details

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

X

- Definition

This element represents the maximum amount authorized for share repurchase by the board of directors.

+ References

No definition available.

+ Details

Name:	pfg_TreasuryStockAcquiredRepurchaseAuthorizationAmount
Namespace Prefix:	pfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of risk reinsured on insurance products per entity policy.

+ References

No definition available.

+ Details

Name:	us-gaap_ReinsuranceRetentionPolicyReinsuredRiskPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=pfg_MasterTransactionAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ReinsurancePolicyTypeAxis=pfg_ReinsuranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=pfg_SuttonCaymanLtd.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ReinsurancePolicyTypeAxis=pfg_CoinsuranceWithFundsWithheldMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: