Debt Service Coverage Ratios

No definition available.

Name:	cik777917_DebtServiceCoverageRatios
Namespace Prefix:	cik777917_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

DebtServiceCoverageRatiosGreaterThan

+ References

No definition available.

+ Details

Name:	cik777917_DebtServiceCoverageRatiosGreaterThan
Namespace Prefix:	cik777917_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

PercentageOfLoanToValueRatioLessThan

+ References

No definition available.

+ Details

Name:	cik777917_PercentageOfLoanToValueRatioLessThan
Namespace Prefix:	cik777917_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage Of Loan To value Ratio

+ References

No definition available.

+ Details

Name:	cik777917_PercentageOfLoanTovalueRatioGreaterThan
Namespace Prefix:	cik777917_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Repurchase and Resale Agreements, Collateral, Percentage

+ References

No definition available.

+ Details

Name:	cik777917_RepurchaseandResaleAgreementsCollateralPercentage
Namespace Prefix:	cik777917_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Securities Loaned Transactions Collateral Fair Value of Domestic Securities

+ References

No definition available.

+ Details

Name:	cik777917_SecuritiesLoanedTransactionsCollateralFairValueofDomesticSecurities
Namespace Prefix:	cik777917_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Securities Loaned Transactions Collateral Maximum

+ References

No definition available.

+ Details

Name:	cik777917_SecuritiesLoanedTransactionsCollateralMaximum
Namespace Prefix:	cik777917_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

UncertainTaxPositionsMeasurementPercentage

+ References

No definition available.

+ Details

Name:	cik777917_UncertainTaxPositionsMeasurementPercentage
Namespace Prefix:	cik777917_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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

- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

+ References

No definition available.

+ Details

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

- Definition

Amount, after accumulated amortization, of deferred sales inducement cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6481654&loc=d3e11214-158414

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6481800&loc=d3e11332-158416

+ Details

Name:	us-gaap_DeferredSalesInducementsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=cik777917_IndividualLifeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ChangeInAccountingEstimateByTypeAxis=us-gaap_ChangeInAccountingMethodAccountedForAsChangeInEstimateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedOtherComprehensiveIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201601Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_RetainedEarningsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Significant Accounting Policies and Pronouncements (Narrative) (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2015 USD ($)
Accounting Policies [Abstract]
Commercial mortgage and other loans, Loan-to-value ratios (greater than)									100.00%
Commercial mortgage and other loans, Loan-to-value ratios (less than)									100.00%
Commercial mortgage and other loans, Debt service coverage ratios (less than)									1.0
Commercial mortgage and other loans, Debt service coverage ratios (greater than)									1.0
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred sales inducements	$ 0				$ 0				$ 0	$ 0	$ 0		$ 684,844
Pre-tax charge to income	(8,667)	$ (16,570)	$ (23,307)	$ (9,243)	$ (30,675)	$ 215,856	$ (331,442)	$ (25,189)	$ (57,787)	$ (171,450)	$ (336,713)
Securities Loaned Transactions Collateral Fair Value of Domestic Securities									102.00%
Securities Loaned Transactions Collateral Fair Value of Foreign Securities									105.00%
Uncertain tax positions measurement percentage (greater than)									50.00%
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Repurchase and Resale Agreements, Collateral, Percentage									95.00%
Individual Life \| Accounting for Certain Reinsurance Contracts
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Pre-tax charge to income							$ 2,000
Accumulated Other Comprehensive Income
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption												$ 30,400
Accumulated Other Comprehensive Income \| ASU 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption	$ (1,539)								$ (1,539)			(1,539)
Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption												(30,400)
Retained earnings \| ASU 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption												$ 7,936