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Contingencies - Narrative (Details)
 12 Months Ended
Feb. 17, 2017
USD ($)
Borrower
Dec. 19, 2014
USD ($)
Dec. 31, 2016
USD ($)
Loan
Trust
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Loan
Loss Contingencies [Line Items]          
Accrued penalty     $ 44,600,000    
Outstanding representation and warranty repurchase demands     $ 47,500,000   $ 97,500,000
Outstanding representation and warranty repurchase demands, number of loans | Loan     239   506
Fisher Cases [Member]          
Loss Contingencies [Line Items]          
Accrued penalty     $ 30,000,000    
Litigation settlement expense     15,000,000    
Amount of penalty in consent order     $ 15,000,000    
RMBS Trusts [Member]          
Loss Contingencies [Line Items]          
Ownership interest in trusts     25.00%    
Number of trusts where trustees received notice of servicer non-performance | Trust     119    
Number of trusts to terminate as servicer in case if allegations proved | Trust     119    
Number of trust where servicing transferred to another loan servicer | Trust     2    
Consumer Financial Protection Bureau [Member]          
Loss Contingencies [Line Items]          
Accrued penalty     $ 12,500,000    
New York Department of Financial Services [Member] | Unfavorable Regulatory Action [Member]          
Loss Contingencies [Line Items]          
Period of oversight by an independent national monitor   2 years      
Independent operations monitor period extendable at discretion Regulator   1 year      
New York Department of Financial Services [Member] | Unfavorable Regulatory Action, Civil Penalty [Member]          
Loss Contingencies [Line Items]          
Litigation settlement expense   $ 100,000,000      
New York Department of Financial Services [Member] | Unfavorable Regulatory Action, Restitution Paid [Member]          
Loss Contingencies [Line Items]          
Litigation settlement expense   $ 50,000,000      
California Department of Business Oversight [Member]          
Loss Contingencies [Line Items]          
Accrued penalty       $ 25,000,000  
California Department of Business Oversight [Member] | Subsequent Event [Member]          
Loss Contingencies [Line Items]          
Litigation settlement expense $ 25,000,000        
Amount of penalty in consent order $ 20,000,000        
Period of debt forgiveness through loan modifications 3 years        
Number of borrowers who did not respond to remediation claims program | Borrower 19,295        
Payments for costs, fees, and penalties $ 5,000,000        
Amount of debt forgiveness through loan modifications 198,000,000        
California Department of Business Oversight [Member] | Subsequent Event [Member] | OFSPL and OBS [Member]          
Loss Contingencies [Line Items]          
Payments for costs, fees, and penalties $ 350,000        
Office of Mortgage Settlement Oversight [Member]          
Loss Contingencies [Line Items]          
Consumer relief credits     2,100,000,000    
Office of Mortgage Settlement Oversight [Member] | Maximum [Member] | First Uncured Violation [Member]          
Loss Contingencies [Line Items]          
Financial penalties in case of uncured violations     1,000,000    
Office of Mortgage Settlement Oversight [Member] | Maximum [Member] | Second Uncured Violation [Member]          
Loss Contingencies [Line Items]          
Financial penalties in case of uncured violations     $ 5,000,000