Fair Value Measurements (Level 3 Inputs) (Details) - SCE - Level 3 - Congestion revenue rights (GWh) - Auction prices $ in Millions	Mar. 31, 2022 USD ($) $ / MWh	Dec. 31, 2021 USD ($)
Quantitative Information About Level 3 Measurements [Line Items]
Fair Value, Assets	$ 43	$ 49
Fair Value, Liabilities	$ 4	$ 5
Minimum
Quantitative Information About Level 3 Measurements [Line Items]
Derivative Asset (Liability) Net, Measurement Input	(18.87)	(18.87)
Maximum
Quantitative Information About Level 3 Measurements [Line Items]
Derivative Asset (Liability) Net, Measurement Input	43.03	43.03
Weighted Average
Quantitative Information About Level 3 Measurements [Line Items]
Derivative Asset (Liability) Net, Measurement Input	1.36	1.46

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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Value of input used to measure net derivative asset (liability).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Paragraph 2
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+ References

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Fair value of financial and nonfinancial obligations.

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