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Commitments and Contingencies (Other Lease Commitments) (Details) - Southern California Edison - Other Operating Leases
$ in Millions
Dec. 31, 2015
USD ($)
Schedule Of Commitments And Contingencies [Line Items]  
2016 $ 68
2017 52
2018 44
2019 35
2020 27
Thereafter 271
Total future commitments $ 497