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DERIVATIVE INSTRUMENTS AND RISK MANAGEMENT - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |
Hedge margin liabilities | $ 325 | $ 17
Maximum term over hedging exposures to the variability of cash flow | 14 years |
Pre-tax gains related to cash flow hedges that are currently deferred in AOCI and are expected to be reclassified to income over the 12 month period ended December 31, 2012 | $ 84 |
Unfavorable Regulatory Action [Member] |  |
Derivative [Line Items] |  |
Derivative, Additional Collateral, Obligation to Return Cash | $ 0 | $ 174

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