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Mortgage Servicing Rights ("MSRs") and Related Liabilities - Narrative (Details) - USD ($)
1 Months Ended 2 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Jul. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Jul. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Servicing Asset at Amortized Cost [Line Items]              
Mortgage servicing liabilities - amortized cost   $ 79,000,000     $ 79,000,000    
Mortgage servicing rights   3,500,000,000     3,500,000,000    
Mortgage servicing rights at fair value   3,485,000,000     3,485,000,000    
Reclassification of earnings     $ 4,000,000     $ 16,000,000  
Cumulative incurred losses related to advances and other receivables associated with inactive and liquidated loans $ 4,000,000 13,000,000 15,000,000 $ 38,000,000   53,000,000  
Servicing fee income accretion expense $ 11,000,000 22,000,000 $ 41,000,000 78,000,000   123,000,000  
Reverse Mortgage Servicing Rights              
Servicing Asset at Amortized Cost [Line Items]              
UPB   30,660,000,000     30,660,000,000   $ 35,112,000,000
Mortgage servicing rights   15,000,000     15,000,000   4,000,000
Amortization of mortgage servicing rights   1,000,000       1,000,000  
Other MSR adjustments       4,000,000      
Mortgage servicing rights at fair value   15,000,000     15,000,000   29,000,000
Mortgage servicing rights              
Servicing Asset at Amortized Cost [Line Items]              
UPB   274,486,000,000     274,486,000,000    
Mortgage servicing liabilities - amortized cost   79,000,000     79,000,000    
Accretion of MSL   7,000,000   11,000,000   1,000,000  
Other adjustments of MSL       $ 56,000,000   $ 6,000,000  
Mortgage servicing rights   3,500,000,000     3,500,000,000    
Mortgage servicing rights at fair value   3,485,000,000     3,485,000,000    
Fair value of MSL   $ 60,000,000     60,000,000   34,000,000
Impairment         $ 0    
Predecessor              
Servicing Asset at Amortized Cost [Line Items]              
Mortgage servicing liabilities - amortized cost             41,000,000
Mortgage servicing rights             2,941,000,000
Mortgage servicing rights at fair value             2,937,000,000
Predecessor | Mortgage servicing rights              
Servicing Asset at Amortized Cost [Line Items]              
UPB             281,380,000,000
Mortgage servicing liabilities - amortized cost             41,000,000
Mortgage servicing rights             2,941,000,000
Mortgage servicing rights at fair value             $ 2,937,000,000