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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount $ 20,324   $ 20,324   $ 33,327
Derivative used in Mortgage Banking Activities          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Fair Value, Net 34   34   26
Derivative, Notional Amount 1,153   1,153   1,170
Trading Assets 17   17   $ 43
Derivative, Gain (Loss) on Derivative, Net $ (4) $ (1) $ (28) $ 61