Business And Significant Accounting Policies (Narrative) (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022 segment entity item
Business And Significant Accounting Polices [Line Items]
Number of reportable business segments | segment		1
Number of board of directors		13
Number of disinterested directors		7
Direct or indirect ownership interest time period		10 years
Number of board positions to be eliminated upon acquisition		2
Number of directors appointed | entity		2
Sempra Energy [Member]
Business And Significant Accounting Polices [Line Items]
Number of disinterested directors		2
Oncor Holdings [Member]
Business And Significant Accounting Polices [Line Items]
Ownership	80.25%	80.25%
Number of directors appointed		2
Oncor Holdings [Member] | Sempra Energy [Member]
Business And Significant Accounting Polices [Line Items]
Percentage of membership interest owned by non-controlling owners	51.00%	51.00%
Ownership holding period		5 years
Texas Transmission [Member]
Business And Significant Accounting Polices [Line Items]
Percentage of membership interest owned by non-controlling owners	19.75%	19.75%
Number of disinterested directors		2
Minimum [Member]
Business And Significant Accounting Polices [Line Items]
Disinterested directors expenditure budget percentage		10.00%
REP Subsidiary One [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Business And Significant Accounting Polices [Line Items]
Concentration risk percentage	29.00%	26.00%
REP Subsidiary Two [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Business And Significant Accounting Polices [Line Items]
Concentration risk percentage	26.00%	24.00%