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Debt and Borrowing Arrangements - Short-Term Borrowings and Related Weighted-Average Interest Rates (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Short-term Debt [Line Items]    
Amount Outstanding $ 4,779 $ 3,517
Commercial paper    
Short-term Debt [Line Items]    
Amount Outstanding $ 4,459 $ 3,410
Weighted- Average Rate 2.20% 1.70%
Bank loans    
Short-term Debt [Line Items]    
Amount Outstanding $ 320 $ 107
Weighted- Average Rate 12.90% 11.50%