Commitments and Contingencies (Commitments Textual) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 24, 2015
Southern California Edison
Schedule Of Commitments And Contingencies [Line Items]
Operating Leases, Rent Expense	$ 96,000,000	$ 78,000,000	$ 75,000,000
Renewable Energy Contracts | Southern California Edison
Schedule Of Commitments And Contingencies [Line Items]
Number of Renewable Energy Contracts	168
Unrecorded Unconditional Purchase Obligation	23,399,000,000
Qualifying Facility Power Purchase Agreements | Southern California Edison
Schedule Of Commitments And Contingencies [Line Items]
Agreements with Number of Qualifying Small Power Production Facilities	130
Unrecorded Unconditional Purchase Obligation	969,000,000
Combined Heat and Power Contracts | Southern California Edison
Schedule Of Commitments And Contingencies [Line Items]
Number of Combined Heat and Power Contracts	11
Other Power Purchase Agreements | Southern California Edison
Schedule Of Commitments And Contingencies [Line Items]
Number of Tolling Arrangements	11
Number of transmission contracts	11
Number of Resource Adequacy Contracts	13
Unrecorded Unconditional Purchase Obligation	4,875,000,000
Other Contractual Obligations | Southern California Edison
Schedule Of Commitments And Contingencies [Line Items]
Long Term Purchase Commitment Cost Incurred	90,000,000	153,000,000	249,000,000
Operating Leases Purchase Power Contracts | Southern California Edison
Schedule Of Commitments And Contingencies [Line Items]
Operating Leases, Rent Expense, Net	1,700,000,000	1,500,000,000	1,300,000,000
Operating Leases, Rent Expense, Contingent Rentals	944,000,000	843,000,000	609,000,000
Capital Leases Power Contracts | Southern California Edison
Schedule Of Commitments And Contingencies [Line Items]
Capital Lease Power Purchase Agreement, Net	203,000,000	209,000,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	46,000,000	39,000,000
Capital Leases Future Minimum Payments, Present Value of Net Minimum Payments, Current	7,000,000	6,000,000
Capital Leases Future Minimum Payments, Present Value of Net Minimum Payments, Noncurrent	196,000,000	203,000,000
Contract Termination
Schedule Of Commitments And Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	28,000,000
Subsequent Event | Southern California Edison
Schedule Of Commitments And Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation				$ 680,000,000	[1]

[1] (in millions)RenewableEnergyContracts QF PowerPurchaseAgreements Other PurchaseAgreements2015$1,009 $254 $83020161,115 217 72420171,162 191 72920181,159 150 59220191,214 88 496Thereafter17,740 69 1,504Total future commitments$23,399 $969 $4,875