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Mortgage Servicing Rights and Related Liabilities - MSR's at Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended 5 Months Ended 7 Months Ended 12 Months Ended
Jan. 03, 2019
Jun. 30, 2019
Dec. 31, 2018
Jul. 31, 2018
Dec. 31, 2019
Feb. 01, 2019
Servicing Asset at Fair Value, Amount [Roll Forward]            
Fair value - beginning of period         $ 3,665  
Fair value - end of period     $ 3,665   3,496  
Mortgage Servicing Rights            
Servicing Asset at Fair Value, Amount [Roll Forward]            
Fair value - beginning of period     3,413 $ 2,937 3,665  
Servicing retained from mortgage loans sold     120 162 434  
Purchases of servicing rights   $ 253 479 144 858  
Sales of servicing assets     (111) 4 (408)  
Changes in valuation inputs or assumptions used in the valuation model     (123) 330 (589)  
Other changes in fair value     (113) (164) (464)  
Fair value - end of period     $ 3,665 $ 3,413 3,496  
Payments to purchase mortgage loans held-for-sale $ 24,000          
Pacific Union Financial, LLC            
Servicing Asset at Fair Value, Amount [Roll Forward]            
Mortgage servicing rights           $ 271
Pacific Union Financial, LLC | Mortgage Servicing Rights            
Servicing Asset at Fair Value, Amount [Roll Forward]            
Mortgage servicing rights         $ 271