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Long-term Debt - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Proforma Debt Instrument [Line Items]    
Long-term debt, fair value $ 11,300 $ 10,400
Commercial Paper
   
Proforma Debt Instrument [Line Items]    
Committed debt facility agreement aggregated 1,100  
Commercial Paper | Long-term debt – current portion
   
Proforma Debt Instrument [Line Items]    
Committed debt facility agreement aggregated $ 300 $ 95