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Consolidations and Transfers of Financial Assets Managed Loans (Details) (USD $)
In Billions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Transfers and Servicing [Abstract]    
Securitized loans in unconsolidated portfolio securitization trusts, unpaid principle balance $ 1.8us-gaap_PrincipalAmountOutstandingOnLoansSecuritized $ 2.1us-gaap_PrincipalAmountOutstandingOnLoansSecuritized