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Impact of Derivative Instruments in Consolidated Balance Sheet (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Derivative [Line Items]    
Derivative Assets $ 26 $ 9
Derivative Liabilities 44 23
Designated as hedging instrument
    
Derivative [Line Items]    
Derivative Assets 25 7
Derivative Liabilities 44 21
Not designated as hedging instrument
    
Derivative [Line Items]    
Derivative Assets 1 2
Derivative Liabilities 0 2
Not designated as hedging instrument | Embedded derivative
    
Derivative [Line Items]    
Derivative Assets 0 1 [1]
Derivative Liabilities 0 0
Swap | Not designated as hedging instrument | Interest rate swap
    
Derivative [Line Items]    
Derivative Assets 0 0
Derivative Liabilities 0 1 [2]
Forward contracts | Not designated as hedging instrument | Foreign exchange contract
    
Derivative [Line Items]    
Derivative Assets 0 1 [1]
Derivative Liabilities 0 0
Forward contracts | Not designated as hedging instrument | Energy related derivative
    
Derivative [Line Items]    
Derivative Assets 1 [1] 0
Derivative Liabilities 0 1 [2]
Cash flow hedging | Forward contracts | Designated as hedging instrument | Foreign exchange contract
    
Derivative [Line Items]    
Derivative Assets 25 [3] 7 [4]
Derivative Liabilities $ 44 [5] $ 21 [6]
[1] Included in Other current assets in the accompanying consolidated balance sheet.
[2] Included in Other accrued liabilities in the accompanying consolidated balance sheet.
[3] Includes $8 million recorded in Other current assets and $17 million recorded in Deferred charges and other assets in the accompanying consolidated balance sheet.
[4] Includes $3 million recorded in Other current assets and $4 million recorded in Deferred charges and other assets in the accompanying consolidated balance sheet.
[5] Includes $26 million recorded in Other accrued liabilities and $18 million recorded in Other liabilities in the accompanying consolidated balance sheet.
[6] Includes $20 million recorded in Other accrued liabilities and $1 million recorded in Other liabilities in the accompanying consolidated balance sheet.