Sale of Accounts Receivable (Narrative) (Details) $ in Millions, € in Billions	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2021 EUR (€)
Sale of Accounts Receivable [Line Items]
Proceeds from the collection of receivables sold	$ 47,300	$ 34,200	$ 33,800
Collections applied to deferred consideration		6,700	13,100
Loss on transfer of accounts receivables to purchasers	11	9	18
Lines of credit	11,200
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized	2,200	1,600
Pledged Assets, Not Separately Reported, Finance Receivables	500	400
Amount of receivables sold	50,300	35,000	$ 34,500
Accounts Receivable Securitization Facility [Member]
Sale of Accounts Receivable [Line Items]
Lines of credit	2,300
Program [Member] | Accounts Receivable Securitization Facility [Member]
Sale of Accounts Receivable [Line Items]
Lines of credit	1,600	$ 1,200
Second Program [Member] | Accounts Receivable Securitization Facility [Member]
Sale of Accounts Receivable [Line Items]
Lines of credit	$ 700			€ 0.6