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Reverse Mortgage Interests, Net - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Jul. 31, 2018
Mar. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Jul. 31, 2018
Sep. 30, 2017
Aug. 01, 2018
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
UPB unsecuritized     $ 1,810                
Net proceeds related to acquisition of HECM related receivables     0                
Unsecuritized HECM                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Interest earned on HECM loans     72                
Participating Interests in HMBS                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
UPB securitized $ 198   44 $ 416 $ 198 $ 416          
Trust 2017-1 and Trust 2017-2                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
UPB securitized 760       760            
Trust 2016-2 and Trust 2016-3                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
UPB unsecuritized 284       284            
Reverse Mortgage Interests, Unsecuritized                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Purchase discount on acquisitions   $ 7                  
Net proceeds related to acquisition of HECM related receivables   1                  
Reverse Mortgage Interests, Unsecuritized | HECM                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Repurchase of HECM loans     608                
Repurchase of HECM loans funded by prior servicer     138                
Participating Interests In HECM Loan                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Purchase of servicing rights   467                  
HMBS Obligations                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Purchase of servicing rights   460                  
Other Interest Securitized and Unsecuritized Interests                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Purchase discount             $ 278        
Receivables From Prior Servicers, Reverse Mortgage Interests                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Account receivables     25                
HECM Related Receivables                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Account receivables   $ 2                  
Mortgage-backed debt                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Debt premium     55                
Mortgage-backed debt | Participating Interests in HMBS                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Debt premium 58   $ 55   58   $ 58        
Predecessor                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
UPB unsecuritized                 $ 2,080    
Net proceeds related to acquisition of HECM related receivables         0 16          
Debt premium                 62    
Purchase discount 82     96 82 96   $ 84 89 $ 43 $ 43
Predecessor | Unsecuritized HECM                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Interest earned on HECM loans $ 38     $ 137 274 370          
Predecessor | Reverse Mortgage Interests, Unsecuritized | HECM                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Repurchase of HECM loans         2,439 3,270          
Repurchase of HECM loans funded by prior servicer         $ 512 $ 802          
Predecessor | Receivables From Prior Servicers, Reverse Mortgage Interests                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Account receivables                 22    
Predecessor | Mortgage-backed debt                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Debt premium                 $ 0