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Financial Instruments (Net Investment Hedges) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Jul. 31, 2017
GBP (£)
Jul. 31, 2017
EUR (€)
Jul. 10, 2017
GBP (£)
Jul. 10, 2017
EUR (€)
Jun. 30, 2017
GBP (£)
hedge
Jun. 30, 2017
EUR (€)
hedge
Senior Notes [Member] | Senior Euro Notes due 2021, interest payable annually at 0.400% [Member]              
Derivative Instruments, Gain (Loss) [Line Items]              
Senior notes amount     € 500,000,000   € 500,000,000    
Senior Notes [Member] | Senior Notes due 2024, interest payable semi-annually at 3.875% [Member]              
Derivative Instruments, Gain (Loss) [Line Items]              
Senior notes amount     € 500,000,000        
Senior Notes [Member] | Senior GBP Notes due 2022, interest payable annually at 1.700% [Member]              
Derivative Instruments, Gain (Loss) [Line Items]              
Senior notes amount | £   £ 300,000,000   £ 300,000,000      
Foreign exchange forward [Member] | Net investment hedging [Member]              
Derivative Instruments, Gain (Loss) [Line Items]              
Number of instruments held | hedge           2 2
Notional amount           £ 298,000,000 € 999,000,000
Loss on net investment hedge | $ $ 63