Annual report pursuant to Section 13 and 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - MSR Hedging Activities (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - MSR Hedging Activities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional value $ 33,327 $ 25,927  
Commitments to Sell Loans [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Commitments to sell residential real estate loans 2,900 1,400  
Derivative used in Mortgage Banking Activities      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Fair Value, Net 26 6  
Notional value 1,170 778  
Trading assets 43 19  
Trading gains (losses) $ 52 $ 30 $ (8)