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 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2020
Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Document Period End Date     Jun. 30, 2020  
Derivative, Notional Amount $ 28,819 $ 25,927 $ 28,819 $ 25,927
Derivative used in Mortgage Banking Activities        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative, Fair Value, Net 31 6 31 6
Derivative, Notional Amount 540 778 540 778
Trading Assets 69 19 69 19
Derivative, Gain (Loss) on Derivative, Net $ 6 $ 18 $ 63 $ 25