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Borrowing and Lines of Credit (Narrative) (Details)
€ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2018
EUR (€)
Mar. 31, 2018
EUR (€)
Sep. 04, 2017
USD ($)
Line of Credit Facility [Line Items]        
Aggregate Line of Credit Facility Maximum Borrowing Capacity $ 4,350,000,000.00      
Maximum Commercial Paper Borrowing Authority 4,350,000,000.00      
Commercial paper, euro-denominated 930,000,000   € 750  
Unsecured bridge loan credit agreement       $ 6,500,000,000
Notes 6.800% Due 2018 [Member]        
Line of Credit Facility [Line Items]        
Repayments of Debt 99,000,000      
EURIBOR plus 0.800% floating rate notes due 2018 [Member]        
Line of Credit Facility [Line Items]        
Repayments of Debt | €   € 750    
Revolving Credit Agreement [Member]        
Line of Credit Facility [Line Items]        
Long-term Line of Credit 0      
Line of Credit Facility, Maximum Borrowing Capacity $ 2,200,000,000.00      
Line of Credit Facility, Expiration Date Aug. 05, 2021 Aug. 05, 2021    
Multicurrency Revolving Credit Agreement [Member]        
Line of Credit Facility [Line Items]        
Long-term Line of Credit $ 0      
Line of Credit Facility, Maximum Borrowing Capacity $ 2,150,000,000      
Line of Credit Facility, Expiration Date Aug. 05, 2021 Aug. 05, 2021