Supplementary Financial Information (Schedule Of Operating Lease, Third Party Joint Project And Other Obligations) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Supplementary Financial Information [Abstract]
Operating lease liabilities	$ 132	$ 133
Investment tax credits	3	4
Customer advances for construction – noncurrent	67	30
Other	75	64
Total employee benefit obligations and other	$ 277	$ 231

Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_OtherLiabilitiesNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant