Income associated with the Pruco-AST revenue sharing agreement.

No definition available.

Name:	cik777917_AstRevenueSharingIncome
Namespace Prefix:	cik777917_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Commissions Paid To PAD.

+ References

No definition available.

+ Details

Name:	cik777917_CommissionsPaidToPad
Namespace Prefix:	cik777917_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Fees associated with the Company's Corporate Owned Life Insurance Policies.

+ References

No definition available.

+ Details

Name:	cik777917_FeesRelatedToCorporateOwnedLifeInsurance
Namespace Prefix:	cik777917_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The maximum amount of mortality risk on any life contract.

+ References

No definition available.

+ Details

Name:	cik777917_MaximumColiMortalityRisk
Namespace Prefix:	cik777917_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Number Of Corporate Owned Life Insurance Policies Sold

+ References

No definition available.

+ Details

Name:	cik777917_NumberOfCorporateOwnedLifeInsurancePoliciesSold
Namespace Prefix:	cik777917_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Affiliated management expense with PIM Inc.

+ References

No definition available.

+ Details

Name:	cik777917_PimManagementExpenses
Namespace Prefix:	cik777917_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Income associated with the Pruco-PSF (Pru Series Fund) revenue sharing agreement.

+ References

No definition available.

+ Details

Name:	cik777917_PsfRevenueSharingIncome
Namespace Prefix:	cik777917_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Reinsurance Retention Policy, Uncollected Charges And Fees Risk, Percentage

+ References

No definition available.

+ Details

Name:	cik777917_ReinsuranceRetentionPolicyUncollectedChargesAndFeesRiskPercentage
Namespace Prefix:	cik777917_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Related Party Transaction, Term

+ References

No definition available.

+ Details

Name:	cik777917_RelatedPartyTransactionTerm
Namespace Prefix:	cik777917_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 710

-SubTopic 10

-Section 30

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

+ Details

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

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

+ Details

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

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 405

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

+ Details

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

- Definition

Amount of interest expense incurred on a debt or other obligation to related party.

+ References

No definition available.

+ Details

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

- Definition

This item represents the amount that could be realized under a life insurance contract or contracts owned by the Entity as of the date of the statement of financial position. Such Entity-owned life insurance policies are commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 325

-SubTopic 30

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6384206&loc=d3e41899-111602

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

+ Details

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

- Definition

Stated amount that is the upper retention limit per entity policy.

+ References

No definition available.

+ Details

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

- Definition

Percentage of risk reinsured in excess of stated retention per entity policy.

+ References

No definition available.

+ Details

Name:	us-gaap_ReinsuranceRetentionPolicyExcessRetentionPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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:	num:percentItemType
Balance Type:	na
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_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

+ Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_SubsidiaryOfCommonParentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_ParentCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_AffiliatedEntityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=cik777917_UparcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=cik777917_ParuMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=cik777917_PurcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=cik777917_ParccMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=cik777917_ParTermMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=cik777917_TermReMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=cik777917_PrudentialOfTaiwanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Related Party Transactions (Narrative) (Details)						1 Months Ended				3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended			24 Months Ended	48 Months Ended
Related Party Transactions (Narrative) (Details)	Jul. 01, 2014 USD ($)	Jan. 01, 2014	Jul. 01, 2013	Dec. 31, 2009	Jan. 31, 2001	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2011 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2015 USD ($) policy	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2013	Jun. 30, 2012 USD ($)	Dec. 31, 2012	Dec. 31, 2013	Oct. 31, 2013 USD ($)
Related Party Transaction [Line Items]
Stock or Unit Option Plan Expense (less than for three month periods)										$ 1,000,000	$ 1,000,000		$ 1,000,000	$ 1,000,000
Deferred Compensation Arrangement with Individual, Compensation Expense										1,000,000	2,000,000		5,000,000	6,000,000
Pension Expense										5,000,000	5,000,000		$ 16,000,000	14,000,000
Defined Contribution Plan, Employer Matching Contribution, Percent (up to)													4.00%
Defined Contribution Plan, Cost Recognized										2,000,000	2,000,000		$ 6,000,000	7,000,000
Commissions Paid To PAD										177,000,000	222,000,000		592,000,000	646,000,000
Life Insurance, Corporate or Bank Owned, Amount							$ 2,812,000,000			2,837,000,000		$ 2,812,000,000	2,837,000,000
Fees related to corporate owned life insurance										13,000,000	10,000,000		34,000,000	31,000,000
Maximum amount of mortality risk																				$ 3,500,000.0
AST Revenue Sharing Income										81,000,000	94,000,000		274,000,000	269,000,000
PSF Revenue Sharing Income										3,000,000	3,000,000		10,000,000	9,000,000
PIM Management Expenses										4,000,000	4,000,000		13,000,000	11,000,000
Line of Credit Facility, Maximum Borrowing Capacity										2,200,000,000			2,200,000,000
Interest Expense										$ 13,000,000	$ 12,500,000		$ 39,400,000	$ 38,400,000
Dividend						$ 230,000,000	$ 410,000,000	$ 338,000,000
Prudential Insurance
Related Party Transaction [Line Items]
Number Of Corporate Owned Life Insurance Policies Sold \| policy													5
Reinsurance Retention Policy, Reinsured Risk, Percentage													100.00%
Prudential Financial
Related Party Transaction [Line Items]
Number Of Corporate Owned Life Insurance Policies Sold \| policy													1
Affiliated Entity \| UPARC
Related Party Transaction [Line Items]
Reinsurance Retention Policy, Reinsured Risk, Percentage	27.00%								90.00%						27.00%		27.00%
Reinsurance Retention Policy, Amount Retained	$ 1,000,000								$ 1,000,000						$ 1,000,000		$ 1,000,000
Reinsurance Retention Policy, Excess Retention, Percentage	30.00%								100.00%						30.00%		30.00%
Reinsurance Retention Policy, Uncollected Charges And Fees Risk, Percentage	30.00%								100.00%						30.00%		30.00%
Affiliated Entity \| PAR U
Related Party Transaction [Line Items]
Reinsurance Retention Policy, Reinsured Risk, Percentage			70.00%													95.00%	70.00%
Affiliated Entity \| PURC
Related Party Transaction [Line Items]
Reinsurance Retention Policy, Reinsured Risk, Percentage		95.00%										70.00%						70.00%
Affiliated Entity \| PARCC
Related Party Transaction [Line Items]
Reinsurance Retention Policy, Reinsured Risk, Percentage				90.00%
Affiliated Entity \| PAR Term
Related Party Transaction [Line Items]
Reinsurance Retention Policy, Reinsured Risk, Percentage																			95.00%
Affiliated Entity \| Term Re
Related Party Transaction [Line Items]
Reinsurance Retention Policy, Reinsured Risk, Percentage		95.00%
Affiliated Entity \| Prudential of Taiwan
Related Party Transaction [Line Items]
Related Party Transaction, Term					2 years