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Commitments and Contingencies (Spent Nuclear Fuel) (Details) - USD ($) $ in Millions	1 Months Ended
	Apr. 30, 2016	Jun. 30, 2010	Sep. 30, 2016
SCE and other owners of San Onofre and Palo Verde
Schedule Of Commitments And Contingencies [Line Items]
Damages sought		$ 142.0
Damage award	$ 162.0
Southern California Edison
Schedule Of Commitments And Contingencies [Line Items]
Damages sought		$ 112.0
Damage award	$ 124.0
Claim to recover damages incurred			$ 56.4

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Schedule Of Commitments And Contingencies [Line Items]

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