Quarterly report pursuant to Section 13 or 15(d)

MORTGAGE LOANS SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio, MSRs Amortization Method Key Assumptions (Details)

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MORTGAGE LOANS SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio, MSRs Amortization Method Key Assumptions (Details) - Amortization method - Residential Mortgage - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Servicing Asset at Amortized Cost [Line Items]    
Constant prepayment rate (annualized), actual 13.70% 9.40%
Constant prepayment rate (annualized), 10% adverse change $ (7) $ (6)
Constant prepayment rate (annualized), 20% adverse change $ (14) $ (12)
Spread over forward interest rate swap rates, actual 8.94% 9.34%
Spread over forward interest rate swap rates, 10% adverse change $ (5) $ (7)
Spread over forward interest rate swap rates, 20% adverse change $ (11) $ (13)