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Mortgage Servicing Rights ("MSRs") and Related Liabilities - MSR's at Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
May 01, 2019
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Feb. 01, 2019
Servicing Asset at Fair Value, Amount [Roll Forward]          
Fair value - beginning of period     $ 3,665    
Fair value - end of period   $ 3,505 3,505    
Mortgage servicing rights          
Servicing Asset at Fair Value, Amount [Roll Forward]          
Fair value - beginning of period     3,665 $ 2,937  
Servicing retained from mortgage loans sold     169 139  
Purchases of servicing rights   253 689 132  
Sales of servicing assets     (294) 4  
Changes in valuation inputs or assumptions used in the valuation model     (542) 283  
Other changes in fair value     (182) (139)  
Fair value - end of period   3,505 3,505 $ 3,356  
Mortgage purchased under subservicing contract $ 24,000        
Pacific Union          
Servicing Asset at Fair Value, Amount [Roll Forward]          
Mortgage servicing rights         $ 271
Pacific Union | Mortgage servicing rights          
Servicing Asset at Fair Value, Amount [Roll Forward]          
Mortgage servicing rights   $ 271 $ 271