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Financing Arrangements (Notes Payable) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Short-term Debt [Line Items]    
Short-term Debt $ 20 $ 569
Commercial paper    
Short-term Debt [Line Items]    
Short-term Debt 0 387
Debt securitization    
Short-term Debt [Line Items]    
Short-term Debt 0 35
Short-term borrowings to banks    
Short-term Debt [Line Items]    
Short-term Debt $ 20 $ 147