(Schedule Of Interest Income And Interest Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure Text Block Supplement [Abstract]
Interest expense	$ 430	$ 597	$ 701
Interest income	93	151	202
Capitalized interest costs	$ 12	$ 31	$ 28