Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements) (Details) - Southern California Edison - Level 3 - Congestion revenue rights - Auction prices $ in Millions	Sep. 30, 2019 USD ($) $ / MWh	Dec. 31, 2018 USD ($) $ / MWh
Quantitative Information About Level 3 Measurements [Line Items]
Fair Value, Assets \| $	$ 70	$ 141
Fair Value, Liabilities \| $	$ 7	$ 0
CAISO CRR auction prices \| Minimum
Quantitative Information About Level 3 Measurements [Line Items]
Fair value inputs, price level ($ per MWh)	(3.33)	(7.41)
CAISO CRR auction prices \| Maximum
Quantitative Information About Level 3 Measurements [Line Items]
Fair value inputs, price level ($ per MWh)	11.58	41.52
CAISO CRR auction prices \| Weighted Average
Quantitative Information About Level 3 Measurements [Line Items]
Fair value inputs, price level ($ per MWh)	(0.96)	(1.62)

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
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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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+ References

No definition available.

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Fair value of financial and nonfinancial obligations.

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