Commitments, Contingent Liabilities And Litigation And Regulatory Matters (Narrative Excluding Litigation) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Commitments Guarantees Contingent Liabilities And Litigation [Line Items]
Purchase Obligation Commercial Mortgage Loan	$ 136
Purchase Obligation To Purchase Or Fund Investments	$ 134

Obligation or commitment to purchase or fund investments at a future date.

No definition available.

Name:	cik777917_PurchaseObligationToPurchaseOrFundInvestments
Namespace Prefix:	cik777917_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant