Quarterly report pursuant to Section 13 or 15(d)

LOAN SALES AND SECURITIZATIONS - Residential Mortgage Portfolio, MSRs Amortization Method Key Assumptions (Details)

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LOAN SALES AND SECURITIZATIONS - Residential Mortgage Portfolio, MSRs Amortization Method Key Assumptions (Details) - Amortization method - Residential Mortgage - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Servicing Asset at Amortized Cost [Line Items]    
Constant prepayment rate (annualized), actual 8.50% 8.30%
Constant prepayment rate (annualized), 10% adverse change $ 0 $ 0
Constant prepayment rate (annualized), 20% adverse change $ 0 $ 0
Spread over forward interest rate swap rates, actual 9.52% 10.49%
Spread over forward interest rate swap rates, 10% adverse change $ 0 $ 0
Spread over forward interest rate swap rates, 20% adverse change $ 0 $ 0