Commitments and Contingencies (Montecito Mudslides) (Details) - Southern California Edison $ in Millions	Jan. 31, 2018 USD ($) fatality structure
Loss Contingencies [Line Items]
Other general liability insurance coverage | $	$ 450
Montecito Mudslides
Loss Contingencies [Line Items]
Structures destroyed | structure	135
Structures damaged | structure	324
Fatalities | fatality	21
Additional presumed fatalities | fatality	2