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Sale of Accounts Receivable (Narrative) (Details)
$ in Millions, € in Billions
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2021
EUR (€)
Dec. 31, 2020
USD ($)
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]        
Transfer of Financial Assets Accounted for as Sales, Fair Value of Derecognized Assets $ 1,700     $ 1,600
Proceeds from Sale of Other Receivables 10,500 $ 8,500    
Proceeds from Collection of Retained Interest in Securitized Receivables 0 3,316    
Loss on transfer of accounts receivables to purchasers 4 2    
Amount of receivables sold 12,100 $ 8,700    
Pledged Assets, Not Separately Reported, Finance Receivables 600     400
Accounts Receivable Securitization Facility [Member]        
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity 2,000      
First Purchasers [Member] | Accounts Receivable Securitization Facility [Member]        
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity 1,400     $ 1,200
Second Purchasers [Member] | Accounts Receivable Securitization Facility [Member]        
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 600   € 0.5