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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 5 Months Ended 7 Months Ended 12 Months Ended
Sep. 30, 2019
Jul. 31, 2018
Sep. 30, 2018
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Jul. 31, 2018
Dec. 31, 2019
Dec. 31, 2017
Servicing Assets at Fair Value [Line Items]                            
Mortgage loans held for sale in foreclosure       $ 21       $ 33     $ 33   $ 21  
Sale of mortgage loans held for sale                     9,397 $ 13,382 41,809 $ 20,772
Gain on sale of mortgage loans held for sale                     93 127 549 454
Net gain on mortgage loans held for sale   $ 44 $ 83 $ 310 $ 360 $ 262 $ 166 93 $ 127 $ 124 176 $ 295 1,098 $ 607
Mortgage loans held for investment in foreclosure               $ 15     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, Legacy Portfolio                            
Servicing Assets at Fair Value [Line Items]                            
Sale of mortgage loans held for sale $ 130                          
Net gain on mortgage loans held for sale 32                          
Sale of mortgage loans 94                          
Transfers to mortgage loans held for sale 12                          
Transfers to real estate owned 5                          
Servicing | Trust 2009-A, Legacy Portfolio                            
Servicing Assets at Fair Value [Line Items]                            
Net gain on mortgage loans held for sale 21                          
Corporate and Other | Trust 2009-A, Legacy Portfolio                            
Servicing Assets at Fair Value [Line Items]                            
Net gain on mortgage loans held for sale $ 11