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Subsequent Events (Details) - Subsequent Event - USD ($)
$ in Millions
Feb. 28, 2019
Feb. 01, 2019
Jan. 03, 2019
Pacific Union Financial, LLC      
Subsequent Event [Line Items]      
Purchase price from cash payment   $ 128  
Seterus Mortgage Servicing Platform And Related IBM Assets      
Subsequent Event [Line Items]      
Purchase price from cash payment $ 8    
GSE Mortgages      
Subsequent Event [Line Items]      
Securities purchased under agreements     $ 24,000
Mortgages      
Subsequent Event [Line Items]      
Securities purchased under agreements     $ 24,000