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 |
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| 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 |
| X | ||||||||||
- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. No definition available.
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| X | ||||||||||
- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. No definition available.
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| X | ||||||||||
- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. No definition available.
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| X | ||||||||||
- References No definition available.
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