Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - MSR Hedging Activities (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - MSR Hedging Activities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount $ 21,923   $ 21,923   $ 33,327
Derivative used in Mortgage Banking Activities          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Fair Value, Net 21   21   26
Derivative, Notional Amount 1,193   1,193   1,170
Trading Assets 24   24   $ 43
Derivative, Gain (Loss) on Derivative, Net $ 22 $ 6 $ (24) $ 63