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Mortgage Loans Held for Sale and Investment - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Sep. 30, 2019
Jul. 31, 2018
Sep. 30, 2018
Sep. 30, 2019
Jul. 31, 2018
Sep. 30, 2019
Feb. 01, 2019
Dec. 31, 2018
Servicing Assets at Fair Value [Line Items]                
Mortgage loans held for sale in foreclosure $ 21     $ 21   $ 21   $ 33
Sale of mortgage loans held for sale     $ 3,543     27,778    
Gain on sale of mortgage loans held for sale     35     367    
Net gain on mortgage loans held for sale     83 360   788    
Mortgage loans held for investment in foreclosure               $ 15
Mortgage loans held for investment                
Servicing Assets at Fair Value [Line Items]                
Sale of mortgage loans     0     94    
Transfers to mortgage loans held for sale     0     12    
Transfers to real estate owned     $ 0     5    
Trust 2009-A                
Servicing Assets at Fair Value [Line Items]                
Sale of mortgage loans held for sale 130              
Sale of mortgage loans 94              
Net gain on mortgage loans held for sale 32              
Transfers to mortgage loans held for sale 12              
Transfers to real estate owned 5              
Pacific Union                
Servicing Assets at Fair Value [Line Items]                
Mortgage loans held for sale 536     $ 536   536 $ 536  
Servicing Segment                
Servicing Assets at Fair Value [Line Items]                
Net gain on mortgage loans held for sale           $ 90    
Servicing Segment | Trust 2009-A                
Servicing Assets at Fair Value [Line Items]                
Net gain on mortgage loans held for sale 21              
Corporate/Other | Trust 2009-A                
Servicing Assets at Fair Value [Line Items]                
Net gain on mortgage loans held for sale $ 11              
Nationstar Mortgage Holdings Inc.                
Servicing Assets at Fair Value [Line Items]                
Sale of mortgage loans held for sale         $ 13,382      
Gain on sale of mortgage loans held for sale         127      
Net gain on mortgage loans held for sale   $ 44     $ 295