Debt (Accounts Receivable Securitization Facility Narrative) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
AmendedRestatedReceivableSecuritizationFacility [Member] | Secured Debt [Member]
Line of Credit Facility [Line Items]
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized	$ 812	$ 595
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers	116
Proceeds Collected on Accounts Receivable Sold under Factoring Facilities	812	476
Europe and Singapore Factoring Agreement
Line of Credit Facility [Line Items]
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized	134	233
Proceeds Collected on Accounts Receivable Sold under Factoring Facilities	133	$ 237
Singapore Discounting Agreement
Line of Credit Facility [Line Items]
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized	$ 57