Supplementary Financial Information (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Property Plant and Equipment [Line Items]
Total assets in service	$ 32,167	$ 31,029
Less accumulated depreciation	8,975	8,659
Net of accumulated depreciation	23,192	22,370
Construction work in progress	1,213	557
Held for future use	26	27
Property, plant and equipment - net	24,431	22,954
Distribution [Member]
Property Plant and Equipment [Line Items]
Total assets in service	$ 16,843	15,994
Composite depreciation rate	2.50%
Avg. life	39 years 6 months
Transmission [Member]
Property Plant and Equipment [Line Items]
Total assets in service	$ 13,372	13,075
Composite depreciation rate	2.90%
Avg. life	34 years 6 months
Other Assets [Member]
Property Plant and Equipment [Line Items]
Total assets in service	$ 1,952	$ 1,960
Composite depreciation rate	5.90%
Avg. life	16 years 10 months 24 days