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Debt and Borrowing Arrangements - Short-Term Borrowings and Related Weighted-Average Interest Rates (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Short-term Debt [Line Items]    
Amount Outstanding $ 4,811 $ 3,517
Commercial paper    
Short-term Debt [Line Items]    
Amount Outstanding $ 4,602 $ 3,410
Weighted-Average Rate 2.40% 1.70%
Bank loans    
Short-term Debt [Line Items]    
Amount Outstanding $ 209 $ 107
Weighted-Average Rate 12.10% 11.50%