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Short-Term Borrowings and Related Weighted-Average Interest Rates (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Short-term Debt [Line Items]    
Amount outstanding $ 4,551 $ 2,531
Commercial Paper    
Short-term Debt [Line Items]    
Amount outstanding $ 4,370 $ 2,371
Weighted-average rate 1.30% 1.00%
Bank Loans    
Short-term Debt [Line Items]    
Amount outstanding $ 181 $ 160
Weighted-average rate 10.60% 10.60%