Valuation And Qualifying Accounts And Reserves (Schedule Of Valuation And Qualifying Accounts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-09, Allowance, Credit Loss
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Balance at Beginning of Year	$ 122	$ 100	$ 110
Additions	88	32	47
Deductions	(12)	(28)	(66)
Balance at End of Year	199	122	100
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	199	122	100
Additions	88	32	47
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	12	28	66
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment	1	18	9
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment	1	18	9
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Balance at Beginning of Year	281	339	325
Additions	18	7	14
Deductions	(90)	(65)	0
Balance at End of Year	209	281	339
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	209	281	339
Additions	18	7	14
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	90	65	0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment	0	0	0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment	$ 0	$ 0	$ 0