Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT SECURITIES AND OTHER SECURITIES INVESTMENT SECURITIES AND OTHER SECURITIES - Gross Realized Gains (Details)

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INVESTMENT SECURITIES AND OTHER SECURITIES INVESTMENT SECURITIES AND OTHER SECURITIES - Gross Realized Gains (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]        
Available-for-sale Securities, Gross Realized Gains $ 9 $ 1 $ 9 $ 6
Available-for-sale Securities, Gross Realized Losses (11) (1) (11) (6)
Debt and Equity Securities, Realized Gain (Loss), Excluding Other-than-temporary Impairment $ (2) $ 0 $ (2) $ 0