Fair Value Measurements (Level 3 Fair Value Measurements) (Details) - SCE - Level 3 - Congestion revenue rights (GWh) - Auction prices $ in Millions	Jun. 30, 2021 USD ($) $ / MWh	Dec. 31, 2020 USD ($)
Quantitative Information About Level 3 Measurements [Line Items]
Fair Value, Assets	$ 77	$ 120
Fair Value, Liabilities	$ 10	$ 12
Minimum
Quantitative Information About Level 3 Measurements [Line Items]
Derivative Asset (Liability) Net, Measurement Input	(1.39)	(9.67)
Maximum
Quantitative Information About Level 3 Measurements [Line Items]
Derivative Asset (Liability) Net, Measurement Input	44.46	300.47
Weighted Average
Quantitative Information About Level 3 Measurements [Line Items]
Derivative Asset (Liability) Net, Measurement Input	2.31	2.75

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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+ References

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Fair value of financial and nonfinancial obligations.

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