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Commitments, Contingencies, Guarantees, and Others - Schedule of Unpaid Principal Balance of Mortgage Loans Originated and Sold to Third Parties Based on Category of Purchaser (Details)
$ in Billions
 12 Months Ended 49 Months Ended
Dec. 31, 2015
USD ($)
Feb. 28, 2009
Subsidiary
Dec. 31, 2014
USD ($)
Loss Contingencies [Line Items]      
Increase (Decrease) In Unresolved Repurchase Claims Face Amount $ (1.2)    
Number of subsidiaries acquired that originated residential mortgage loans | Subsidiary   3  
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Losses realized by third party 22.0    
Subsidiaries      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Estimated Unpaid Principal Balance 20.0   $ 23.0
Unpaid principal balance, delinquent 90 days or greater 3.0    
Subsidiaries | 2005 to 2008 Year      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 111.0    
Subsidiaries | 2008      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 4.0    
Subsidiaries | 2007      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 21.0    
Subsidiaries | 2006      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 41.0    
Subsidiaries | 2005      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 45.0    
Subsidiaries | Government-sponsored enterprises (“GSEs”)      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Estimated Unpaid Principal Balance 2.0   3.0
Subsidiaries | Government-sponsored enterprises (“GSEs”) | 2005 to 2008 Year      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 11.0    
Subsidiaries | Government-sponsored enterprises (“GSEs”) | 2008      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 1.0    
Subsidiaries | Government-sponsored enterprises (“GSEs”) | 2007      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 4.0    
Subsidiaries | Government-sponsored enterprises (“GSEs”) | 2006      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 3.0    
Subsidiaries | Government-sponsored enterprises (“GSEs”) | 2005      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 3.0    
Subsidiaries | Insured Securitizations      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Estimated Unpaid Principal Balance 4.0   4.0
Subsidiaries | Insured Securitizations | 2005 to 2008 Year      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance $ 20.0    
Percent covered by bond insurance 48.00%    
Original principal balance, sold to third party with repurchase requests $ 16.0    
Original principal balance, sold to third party without repurchase requests 4.0    
Subsidiaries | Insured Securitizations | 2008      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 0.0    
Subsidiaries | Insured Securitizations | 2007      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 2.0    
Subsidiaries | Insured Securitizations | 2006      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 8.0    
Subsidiaries | Insured Securitizations | 2005      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 10.0    
Subsidiaries | Uninsured Securitizations and Other      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Estimated Unpaid Principal Balance 14.0   16.0
Subsidiaries | Uninsured Securitizations and Other | 2005 to 2008 Year      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 80.0    
Subsidiaries | Uninsured Securitizations and Other | 2008      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 3.0    
Subsidiaries | Uninsured Securitizations and Other | 2007      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 15.0    
Subsidiaries | Uninsured Securitizations and Other | 2006      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 30.0    
Subsidiaries | Uninsured Securitizations and Other | 2005      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 32.0    
Subsidiaries | Uninsured Securitizations | 2005 to 2008 Year      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 48.0    
Subsidiaries | Private Investors | 2005 to 2008 Year      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 22.0    
Subsidiaries | Various Known and Unknown Investors | 2005 to 2008 Year      
Mortgage Loans on Real Estate, Sold to Third Party [Abstract]      
Original Principal Balance 10.0    
Representation and Warranty Liability [Member] | Subsidiaries      
Loss Contingencies [Line Items]      
Loss Contingency, Range of Possible Loss, Portion Not Accrued $ 1.6   $ 2.1