Quarterly report pursuant to Section 13 or 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, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Collateral received under contractual provisions $ 912us-gaap_DerivativeCollateralObligationToReturnCash $ 548us-gaap_DerivativeCollateralObligationToReturnCash
Maximum term over hedging exposures to the variability of cash flow 35 years  
Pre-tax losses related to cash flow hedges that are currently deferred in AOCI and are expected to be reclassified to income within twelve months 351us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths  
Derivative, Collateral, Right to Reclaim Cash $ 1us-gaap_DerivativeCollateralRightToReclaimCash