Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2021	Feb. 25, 2022	Dec. 31, 2020	Dec. 31, 2019
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Period End Date	Dec. 31, 2021
Document Transition Report	false
Entity File Number	333-100240
Entity Registrant Name	Oncor Electric Delivery Company LLC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	75-2967830
Entity Address, Address Line One	1616 Woodall Rodgers Fwy.
Entity Address, City or Town	Dallas
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75202
City Area Code	214
Local Phone Number	486-2000
Title of 12(b) Security	None
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	Yes
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float	$ 0
Capital account, units outstanding	635,000,000	635,000,000	635,000,000	635,000,000
Entity Common Stock, Shares Outstanding		0
Documents Incorporated By Reference	None
Entity Central Index Key	0001193311
Auditor Name	Deloitte & Touche LLP
Auditor Firm ID	34
Auditor Location	Dallas, Texas
Oncor Electric Delivery Holdings Company LLC [Member]
Entity Outstanding Membership Interests		80.25%
Texas Transmission [Member]
Entity Outstanding Membership Interests		19.75%