Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Mortgage Banking Activities (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Mortgage Banking Activities (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Derivative assets:    
Total derivative assets $ 498 $ 322
Derivative liabilities:    
Total derivative liabilities (441) (331)
Derivative used in Mortgage Banking Activities    
Derivatives, Fair Value [Line Items]    
Derivative, Fair Value, Net $ 8 $ 7