HELD-TO-MATURITY SECURITIES - Narrative (Details) - USD ($) |
12 Months Ended | |
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Dec. 31, 2017 |
Dec. 31, 2016 |
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| Held-to-maturity Securities [Abstract] | ||
| Available-for-sale securities transferred to held-to-maturity securities | $ 1,000,000,000 | $ 2,870,000,000 |
| Unrealized Net Losses Recognized In OCI At Time Of Transfer Of Available For Sale Securities Transferred To Held To Maturity Securities | 14,000,000 | |
| Unrealized Net Gains Recognized In OCI At Time Of Transfer Of Available For Sale Securities Transferred To Held To Maturity Securities | 58,000,000 | |
| Other than temporary impairment losses, held-to-maturity | $ 0 | $ 0 |
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- Definition Available For Sale Securities Transferred To Held To Maturity Securities. No definition available.
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- Definition Unrealized Net Gains Recognized In OCI At The Time Of Transfer Of Available For Sale Securities Transferred To Held To Maturity Securities. No definition available.
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- Definition Unrealized Net Losses Recognized In OCI At Time Of Transfer Of Available For Sale Securities Transferred To Held To Maturity Securities No definition available.
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- 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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