Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - MSR Hedging Activities (Details)

v3.10.0.1
DERIVATIVE FINANCIAL INSTRUMENTS - MSR Hedging Activities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount $ 5,377   $ 5,377   $ 8,375
Notional amount corresponds to trading assets, fair value 0   0   3
Derivative used in Mortgage Banking Activities          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount 0   0   $ 188
Gains losses related to derivative instruments Included in Mortgage securities $ 0 $ 2 $ (8) $ 1