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Financial Instruments (Fair Value Hedge) (Details) - Dec. 31, 2018 - Fair Value Hedging - Interest rate swap
$ in Millions
USD ($)
EUR (€)
Derivative    
Derivative, notional amount | €   € 500,000,000
Senior Notes | Senior Euro Notes due July 2024, interest payable annually at 1.100% (2024 Euro Notes)    
Derivative    
Derivative fair value | $ $ 1