Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Fair Value Option-Changs in Fair Value (Details)

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FAIR VALUES OF ASSETS AND LIABILITIES - Fair Value Option-Changs in Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Measurements, Recurring        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Net gains (losses) from fair value changes $ 6 $ (4) $ 12 $ (1)