Revenues (Disaggregation Of Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	$ 1,128,000	$ 1,009,000	$ 3,078,000	$ 2,766,000
Revenues collected for pass-through expenses	310,000	277,000	902,000	806,000
Total operating revenues	1,438,000	1,286,000	3,980,000	3,572,000
Distribution Base Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	710,000	650,000	1,888,000	1,708,000
Transmission Base Revenues (TCOS Revenues) [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	369,000	340,000	1,101,000	1,004,000
Transmission Base Revenues (TCOS Revenues) [Member] | Third-Party Wholesale Customers [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	237,000	220,000	707,000	649,000
Transmission Base Revenues (TCOS Revenues) [Member] | REPS Serving Oncor Distribution Customers, Through TCRF [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	132,000	120,000	394,000	355,000
Other Miscellaneous Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	49,000	19,000	89,000	54,000
TCRF - Third-party Wholesale Transmission Service [Member]
Disaggregation of Revenue [Line Items]
Revenues collected for pass-through expenses	291,000	261,000	862,000	770,000
EECRF And Other Regulatory Charges [Member]
Disaggregation of Revenue [Line Items]
Revenues collected for pass-through expenses	$ 19,000	$ 16,000	$ 40,000	$ 36,000