v3.22.0.1
Servicing of Financial Assets (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mar. 27, 2019
Servicing Assets at Fair Value [Line Items]        
Payments to Acquire Mortgage Servicing Rights (MSR) $ 72 $ 59 $ 24  
Unpaid Principal Balance of Outstanding Underlying MSRs Purchased     409  
Residential mortgage servicing rights at fair value 418 296    
Flow Purchase price [Member] [Domain]        
Servicing Assets at Fair Value [Line Items]        
Payments to Acquire Mortgage Servicing Rights (MSR) 72 59 13  
Bulk Purchase price [Member] [Domain]        
Servicing Assets at Fair Value [Line Items]        
Payments to Acquire Mortgage Servicing Rights (MSR)     4  
Residential Real Estate [Member]        
Servicing Assets at Fair Value [Line Items]        
Servicing Asset       $ 2
Commercial Real Estate [Member]        
Servicing Assets at Fair Value [Line Items]        
Residential mortgage servicing rights at fair value $ 96 $ 81    
Residential First Mortgage [Member]        
Servicing Assets at Fair Value [Line Items]        
Financing Receivable, Significant Sales     $ 167