Quarterly report pursuant to Section 13 or 15(d)

MORTGAGE LOAN SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio, MSRs Fair Value Method (Details)

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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jan. 01, 2020
Jun. 30, 2019
Servicing Asset at Fair Value, Amount [Roll Forward]              
Fair value, beginning of period $ 165 $ 10 $ 7 $ 10      
Servicing Asset at Fair Value, Additions 26 0 40 0      
Time decay (2) 0 (4) 0      
Servicing Asset At Fair Value Payoffs (10) 0 (16) 0      
Changes in valuation inputs or assumptions (less than) (7) (1) (60) (1)      
Fair value, end of period: $ 165 $ 10 $ 7 $ 10 $ 172 $ 205 $ 9
Fair value method              
Servicing Asset at Fair Value, Amount [Roll Forward]              
Weighted-average life (years) 6 years 6 months 6 years 4 months 24 days 6 years 6 months 6 years 4 months 24 days