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
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Notional Amount $ 34,208   $ 33,327
Derivative used in Mortgage Banking Activities      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Fair Value, Net 65   26
Derivative, Notional Amount 875   1,170
Trading Assets 9   $ 43
Derivative, Gain (Loss) on Derivative, Net $ (46) $ 57