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Hedges and Derivative Financial Instruments (Schedule of Net Investment Hedging) (Details)
€ in Millions, $ in Millions
Dec. 31, 2016
EUR (€)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
Net Investment Hedges      
Derivative [Line Items]      
Notional Amount € 500 $ 527  
Senior note - 0.625% maturing 2020      
Derivative [Line Items]      
Stated interest rate 0.625% 0.625% 0.625%