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Short-Term Borrowings and Related Weighted-Average Interest Rates (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Short-term Debt [Line Items]    
Amount outstanding $ 4,483 $ 1,305
Commercial Paper    
Short-term Debt [Line Items]    
Amount outstanding $ 4,211 $ 1,101
Weighted-average rate 0.50% 0.40%
Bank Loans    
Short-term Debt [Line Items]    
Amount outstanding $ 272 $ 204
Weighted-average rate 10.10% 8.80%