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Commitments, Contingent Liabilities And Litigation And Regulatory Matters (Narrative Excluding Litigation) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Commitments Guarantees Contingent Liabilities And Litigation [Line Items]  
Commitments to fund commercial loans $ 0cik881453_CommitmentsToFundCommercialLoans
Commitments to fund investments $ 12cik881453_CommitmentsToFundInvestments