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Commitments and Guarantees, Contingent Liabilities and Litigation and Regulatory Matters (Narrative Excluding Litigation) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Yield Maintenance Guarantee      
Commitments Guarantees Contingent Liabilities And Litigation [Line Items]      
Guarantee obligation - maximum exposure $ 308.0   $ 323.0
Securities Lending Transactions      
Commitments Guarantees Contingent Liabilities And Litigation [Line Items]      
Fair value of the loaned securities, minimum collateral (greater than) 102.00%    
Guarantee obligation - maximum exposure $ 13,602.0   14,334.0
Credit Enhancements      
Commitments Guarantees Contingent Liabilities And Litigation [Line Items]      
Guarantee Expiration 15 years    
Guarantee obligation - maximum exposure $ 5.0   5.0
Serviced Mortgage Loans      
Commitments Guarantees Contingent Liabilities And Litigation [Line Items]      
Minimum percentage share of losses incurred of loan balance 2.00%    
Maximum percentage share of losses incurred of loan balance 20.00%    
Mortgages subject to loss-sharing arrangements $ 10,560.0    
Average debt service coverage ratio of mortgages subject to loss-sharing arrangements 2.09    
Average loan-to-value ratio of mortgages subject to loss-sharing arrangements 61.00%    
Indemnification of Serviced Mortgage Loans, Losses $ 0.0 $ 1.0  
Guarantee obligation - maximum exposure $ 1,324.0   $ 1,248.0