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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Servicing Asset at Fair Value, Amount [Roll Forward]        
Fair value, beginning of period $ 327 $ 172 $ 210 $ 7
Servicing Asset at Fair Value, Additions 31 30 103 70
Time decay (4) (2) (11) (6)
Servicing Asset At Fair Value Payoffs (17) (13) (50) (29)
Changes in valuation inputs or assumptions (less than) 1 4 27 (56)
Fair value, end of period: 338 191 338 191
Servicing Asset at Fair Value, Other Changes that Affect Balance $ 0 $ 0 $ 59 0
Revision of Prior Period, Adjustment        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Fair value, beginning of period       $ 205
Fair value, end of period:        
Fair value method        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Weighted-average life (years) 7 years 6 years 4 months 24 days 7 years 6 years 4 months 24 days