Annual report pursuant to Section 13 and 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Mortgage Banking Activities (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Mortgage Banking Activities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value $ 25,927 $ 4,877
Derivative assets:    
Derivative assets gross 856 500
Derivative liabilities:    
Total derivative liabilities (521) (404)
Derivative used in Mortgage Banking Activities    
Derivatives, Fair Value [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 778 0
Derivative liabilities:    
Trading Assets 19 0
Derivative, Gain (Loss) on Derivative, Net 30 (8)
Commitments to Sell Loans [Member]    
Derivatives, Fair Value [Line Items]    
Commitments to sell residential real estate loans $ 1,400 $ 800