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MORTGAGE LOAN SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio, MSRs Fair Value Method (Details) - Residential Mortgage - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Jan. 01, 2020
Mar. 31, 2019
Servicing Asset at Fair Value, Amount [Roll Forward]          
Fair value, beginning of period $ 7 $ 10      
Servicing Asset at Fair Value, Additions 14        
Time decay (2)        
Servicing Asset At Fair Value Payoffs (6)        
Changes in valuation inputs or assumptions (less than) (53)        
Fair value, end of period: $ 7 $ 10 $ 165 $ 205 $ 10
Fair value method          
Servicing Asset at Fair Value, Amount [Roll Forward]          
Weighted-average life (years) 6 years 4 months 24 days 6 years 7 months 6 days