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Financing (Long-Term Debt Repayments) (Narrative) (Details) - Senior notes
€ in Millions, $ in Millions
Sep. 30, 2018
USD ($)
Jun. 30, 2017
EUR (€)
1.65% senior unsecured notes due 2018    
Debt Instrument [Line Items]    
Debt instrument, face amount | $ $ 500  
Floating rate senior unsecured notes due 2017    
Debt Instrument [Line Items]    
Debt instrument, face amount | €   € 500