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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Abstract] |  |  |
Federal corporate tax rate | 21.00% | 21.00% | 35.00%
Net deferred tax asset |  |  | $ 1,531

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