Summary of Significant Accounting Policies (Emissions) (Details) - SCE - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Significant Accounting Policies [Line Items]
GHG allowances	$ 128	$ 87
GHG emission obligations	117	55
Regulatory liabilities	10,183	9,175
LCFS net sales proceeds
Significant Accounting Policies [Line Items]
Regulatory liabilities	$ 248	$ 218

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 405
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481854/980-405-25-1

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