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Commitments and Contingencies (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Standby letters of credit [Member]
Sep. 30, 2014
Performance Guarantee [Member]
Aug. 28, 2008
Bond Market Fund Litigation [Member]
Sep. 30, 2014
Margin Requirements [Member]
Commitments and Contingencies Disclosure [Line Items]        
Aggregate face amount of letter of credit agreements $ 240      
Funds drawn under LOC's       0
Alleged minimum percentage of fund assets invested in CMOs and mortgage-backed securities without obtaining shareholder vote     25.00%  
Liability for guarantees   $ 0