Debt (Accounts Receivable Securitization Facility Narrative) (Details) - USD ($) $ in Millions		3 Months Ended
	Jul. 06, 2020	Mar. 31, 2021	Dec. 31, 2020
Accounts Receivable Securitization Facility [Member] | Secured Debt [Member]
Line of Credit Facility [Line Items]
Repayments of Lines of Credit	$ 87
AmendedRestatedReceivableSecuritizationFacility [Member] | Secured Debt [Member]
Line of Credit Facility [Line Items]
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized	$ 87	$ 268
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers		50
Europe and Singapore Factoring Agreement
Line of Credit Facility [Line Items]
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized		36	$ 233
Singapore Discounting Agreement
Line of Credit Facility [Line Items]
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized		$ 20