Name:	plic_DaysDelinquentValuationAllowance
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Data Type:	xbrli:durationItemType
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Period Type:	duration

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Includes net investment in direct financing lease.

No definition available.

Name:	plic_FinancingReceivableAndDirectFinancingLeaseNetInvestmentInLeaseAllowanceForCreditLossExcludingAccruedInterest
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Includes net investment in direct financing lease.

No definition available.

Name:	plic_FinancingReceivableAndDirectFinancingLeaseNetInvestmentInLeaseExcludingAccruedInterestAllowanceForCreditLossRecovery
Namespace Prefix:	plic_
Data Type:	xbrli:monetaryItemType
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

Name:	plic_FinancingReceivableAndDirectFinancingLeaseNetInvestmentInLeaseExcludingAccruedInterestAllowanceForCreditLossRollforward
Namespace Prefix:	plic_
Data Type:	xbrli:stringItemType
Balance Type:	na
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Amount of excluding accrued interest, of decrease in allowance for credit loss on financing receivable from write off, Includes net investment in direct financing lease.

No definition available.

Name:	plic_FinancingReceivableAndDirectFinancingLeaseNetInvestmentInLeaseExcludingAccruedInterestAllowanceForCreditLossWriteOff
Namespace Prefix:	plic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable includes net investment in direct financing lease.

No definition available.

Name:	plic_FinancingReceivableAndDirectFinancingLeaseNetInvestmentInLeaseExcludingAccruedInterestCreditLossExpenseReversal
Namespace Prefix:	plic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447