Revenues (Disaggregation Of Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	$ 959,000	$ 879,000
Total revenues collected for pass-through expenses	290,000	260,000
Total operating revenues	1,249,000	1,139,000
Distribution Base Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	578,000	540,000
Transmission Base Revenues (TCOS Revenues) [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	363,000	322,000
Transmission Base Revenues (TCOS Revenues) [Member] | Third-Party Wholesale Customers [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	233,000	208,000
Transmission Base Revenues (TCOS Revenues) [Member] | REPS Serving Oncor Distribution Customers, Through TCRF [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	130,000	114,000
Other Miscellaneous Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	18,000	17,000
TCRF - Third-party Wholesale Transmission Service [Member]
Disaggregation of Revenue [Line Items]
Total revenues collected for pass-through expenses	281,000	249,000
EECRF [Member]
Disaggregation of Revenue [Line Items]
Total revenues collected for pass-through expenses	$ 9,000	$ 11,000