Annual report pursuant to Section 13 and 15(d)

INVESTMENT SECURITIES AND OTHER SECURITIES - Realized Securities Gains (Losses) (Details)

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INVESTMENT SECURITIES AND OTHER SECURITIES - Realized Securities Gains (Losses) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]      
Available-for-sale Securities, Gross Realized Gains $ 7 $ 10 $ 23
Available-for-sale Securities, Gross Realized Losses (28) (10) (21)
Debt and Equity Securities, Gain (Loss) (21) 0 2
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities 0 (4) (2)
Available-for-sale Securities, Gross Realized Gain (Loss) $ (21) $ (4) $ 0