Commitments and Contingencies (Commitments Textual) (Details) - Southern California Edison $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) contracts agreements	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Schedule Of Commitments And Contingencies [Line Items]
Operating Leases, Rent Expense	$ 80	$ 96	$ 78
Renewable Energy Contracts
Schedule Of Commitments And Contingencies [Line Items]
Number of Renewable Energy Contracts | contracts	93
Signed contracts, due in next twelve months	$ 1,234
Signed contracts, due within two years	1,417
Signed contracts, due within three years	1,472
Signed contracts, due within four years	1,562
Signed contracts, due within five years	1,605
Signed contracts, due after five years	$ 21,439
Qualifying Facility Power Purchase Agreements
Schedule Of Commitments And Contingencies [Line Items]
Agreements with Number of Qualifying Small Power Production Facilities | contracts	71
Signed contracts, due in next twelve months	$ 223
Signed contracts, due within two years	189
Signed contracts, due within three years	149
Signed contracts, due within four years	87
Signed contracts, due within five years	39
Signed contracts, due after five years	$ 69
Combined Heat and Power Contracts
Schedule Of Commitments And Contingencies [Line Items]
Number of Combined Heat and Power Contracts | agreements	6
Other Power Purchase Agreements
Schedule Of Commitments And Contingencies [Line Items]
Number of Tolling Arrangements | agreements	9
Number of Resource Adequacy Contracts | contracts	11
Signed contracts, due in next twelve months	$ 741
Signed contracts, due within two years	758
Signed contracts, due within three years	589
Signed contracts, due within four years	503
Signed contracts, due within five years	459
Signed contracts, due after five years	1,022
Signed contracts, not meeting critical contract provisions [Member]
Schedule Of Commitments And Contingencies [Line Items]
Signed contracts, due in next twelve months	29
Signed contracts, due within two years	166
Signed contracts, due within three years	257
Signed contracts, due within four years	352
Signed contracts, due within five years	747
Signed contracts, due after five years	16,429
Other Contractual Obligations
Schedule Of Commitments And Contingencies [Line Items]
Long Term Purchase Commitment Cost Incurred	182	90	153
Other commitments due in next twelve months	140
Other commitments due in third year	101
Other commitments due in fourth year	56
Other commitments due in fifth year	59
Other commitments due after fifth year	547
Other Contractual Obligations Not Meeting Critical Contract Provisions [Member]
Schedule Of Commitments And Contingencies [Line Items]
Other commitments due in next twelve months	10
Other commitments due in third year	98
Other commitments due in fourth year	82
Other commitments due in fifth year	79
Other commitments due after fifth year	483
Operating Leases Purchase Power Contracts
Schedule Of Commitments And Contingencies [Line Items]
Net operating leases expense	1,700	1,700	1,500
Contingent operating lease expense	1,070	944	$ 843
Capital Leases Power Contracts
Schedule Of Commitments And Contingencies [Line Items]
Capital Lease Power Purchase Agreement, Net	8	203
Capital lease accumulated depreciation	2	46
Capital Leases Future Minimum Payments, Present Value of Net Minimum Payments, Current	1	7
Capital Leases Future Minimum Payments, Present Value of Net Minimum Payments, Noncurrent	$ 7	$ 196