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, unless otherwise specified
Dec. 31, 2011
Derivative [Line Items]  
Collateral received under contractual provisions $ 55
Aggregate fair value additional collateral 10
Maximum term over hedging exposures to the variability of cash flow 39 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 $ 83