Valuation And Qualifying Accounts And Reserves (Schedule Of Valuation And Qualifying Accounts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Balance at Beginning of Year	$ 100	$ 110	$ 84
Additions	32	47	23
Deductions	(28)	(66)	(19)
Other	18	9	22
Balance at End of Year	$ 122	$ 100	$ 110