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Debt and Borrowing Arrangements - Short-Term Borrowings and Related Weighted-Average Interest Rates (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Short-term Debt [Line Items]    
Amount Outstanding $ 4,065 $ 3,192
Commercial paper    
Short-term Debt [Line Items]    
Amount Outstanding $ 3,532 $ 3,054
Weighted-Average Rate 3.00% 2.90%
Bank loans    
Short-term Debt [Line Items]    
Amount Outstanding $ 533 $ 138
Weighted-Average Rate 6.50% 10.50%