Annual report pursuant to Section 13 and 15(d)

DERIVATIVE INSTRUMENTS AND RISK MANAGEMENT - Fair Values of Derivative Assets and Liabilities by Hedge Type (Detail)

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DERIVATIVE INSTRUMENTS AND RISK MANAGEMENT - Fair Values of Derivative Assets and Liabilities by Hedge Type (Detail) (Interest Expense, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Fixed-Rate Debt and Capital Leases
   
Derivatives, Fair Value [Line Items]    
Amount of Gain (Loss) Recognized in Income $ (20) $ (320)
Interest rate contracts
   
Derivatives, Fair Value [Line Items]    
Amount of Gain (Loss) Recognized in Income $ 20 $ 320