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Borrowing and Lines of Credit (Narrative) (Details)
€ in Millions
9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2017
EUR (€)
Sep. 04, 2017
USD ($)
Line of Credit Facility [Line Items]      
Aggregate Line of Credit Facility Maximum Borrowing Capacity $ 4,350,000,000    
Maximum Commercial Paper Borrowing Authority 4,350,000,000    
Commercial paper, euro-denominated 594,000,000 € 500  
Unsecured bridge loan credit agreement     $ 6,500,000,000
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    
Line of Credit Facility, Expiration Date 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