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Financing Arrangements (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Short-term Debt [Line Items]    
Total notes payable   $ 34
Notes payable $ 1,442 34
Commercial paper    
Short-term Debt [Line Items]    
Total notes payable 1,138 0
Short-term borrowings to banks    
Short-term Debt [Line Items]    
Total notes payable $ 304 $ 34