HELD-TO-MATURITY SECURITIES - Narrative (Details) - USD ($) |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
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| Held-to-maturity Securities [Abstract] | ||
| Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities | $ 0 | |
| Available For Sale Securities Transferred To Held To Maturity Securities | $ (2,833,000,000) | $ 0 |
| X | ||||||||||
- Definition Available For Sale Securities Transferred To Held To Maturity Securities. No definition available.
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| X | ||||||||||
- References No definition available.
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- Definition The amount by which the fair value of an investment in debt securities categorized as Held-to-maturity is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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