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Short-Term Borrowings and Related Weighted-Average Interest Rates (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Short-term Debt [Line Items]    
Amount outstanding $ 1,807 $ 1,636
Commercial Paper
   
Short-term Debt [Line Items]    
Amount outstanding 1,409 1,410
Weighted-average rate 0.40% 0.40%
Bank Loans
   
Short-term Debt [Line Items]    
Amount outstanding $ 398 $ 226
Weighted-average rate 7.40% 7.00%