Debt (Schedule Of Short-Term Debt And Current Portion Of Long-Term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Unsecured debt	$ 1,155	$ 1,448
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Short-term debt and current portion of long-term debt	Short-term debt and current portion of long-term debt
Other notes	$ 80	$ 180
Short-term debt and current portion of long-term debt	$ 1,296	$ 1,693