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Debt - Narrative (Details)
$ in Millions
Jun. 30, 2015
USD ($)
May. 31, 2015
EUR (€)
Dec. 31, 2014
USD ($)
May. 31, 2014
EUR (€)
Debt Instrument [Line Items]        
Outstanding commercial paper | $ $ 805   $ 1,400  
Notes Payable, Other Payables [Member] | 1.25% Euro Notes Due May 22, 2023 [Member]        
Debt Instrument [Line Items]        
Face value of notes   € 500,000,000    
Stated interest rate on notes   1.25%    
Discount rate on face value of notes   99.239%    
Notes Payable, Other Payables [Member] | 2.125% Euro Notes Due May 22, 2030 [Member]        
Debt Instrument [Line Items]        
Face value of notes   € 500,000,000    
Stated interest rate on notes   2.125%    
Discount rate on face value of notes   99.303%    
Net Investment Hedging [Member] | Euro Notes [Member]        
Debt Instrument [Line Items]        
Face value of notes   € 1,000,000,000   € 1,000,000,000