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Sale of Accounts Receivable (Narrative) (Details)
€ in Billions
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
EUR (€)
Accounts Receivable Securitization Programs [Line Items]        
Proceeds from transfer of receivables $ 1,500,000,000 $ 1,400,000,000    
Deferred receivables consideration 379,000,000 307,000,000    
Proceeds from the collection of receivables sold 34,800,000,000 33,500,000,000 $ 34,300,000,000  
Collections applied to deferred consideration 14,800,000,000 12,500,000,000 11,900,000,000  
Receivables sold under securitization facility derecognized during the period 1,900,000,000 1,700,000,000    
Loss on transfer of accounts receivables to purchasers 18,000,000 $ 10,000,000 $ 6,000,000  
Lines of credit 10,400,000,000      
Accounts Receivable Securitization Facility [Member]        
Accounts Receivable Securitization Programs [Line Items]        
Lines of credit 1,800,000,000      
Program [Member] | Accounts Receivable Securitization Facility [Member]        
Accounts Receivable Securitization Programs [Line Items]        
Lines of credit 1,200,000,000.0      
Second Program [Member] | Accounts Receivable Securitization Facility [Member]        
Accounts Receivable Securitization Programs [Line Items]        
Lines of credit $ 600,000,000     € 0.5