Annual report pursuant to Section 13 and 15(d)

DERIVATIVE INSTRUMENTS AND RISK MANAGEMENT - Additional Information (Detail)

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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