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Sale of Accounts Receivable (Narrative) (Details)
€ in Billions
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
EUR (€)
Accounts Receivable Securitization Programs [Line Items]        
Proceeds from transfer of receivables $ 1,600,000,000 $ 1,400,000,000    
Deferred receivables consideration 0 446,000,000    
Proceeds from the collection of receivables sold 34,200,000,000 33,800,000,000 $ 34,800,000,000  
Collections applied to deferred consideration 6,700,000,000 13,100,000,000 14,800,000,000  
Loss on transfer of accounts receivables to purchasers 9,000,000 18,000,000 18,000,000  
Lines of credit 10,200,000,000      
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized 1,600,000,000 1,900,000,000    
Pledged Assets, Not Separately Reported, Finance Receivables 400,000,000      
Amount of receivables sold 35,000,000,000.0 $ 34,500,000,000 $ 35,700,000,000  
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      
Second Program [Member] | Accounts Receivable Securitization Facility [Member]        
Accounts Receivable Securitization Programs [Line Items]        
Lines of credit $ 600,000,000     € 0.5