San Onofre Issues (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended		1 Months Ended	3 Months Ended		6 Months Ended		0 Months Ended		3 Months Ended		6 Months Ended		16 Months Ended			6 Months Ended	12 Months Ended					6 Months Ended						6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013 San Onofre (nuclear)	Feb. 22, 2014 San Onofre (nuclear) Insurance Claims [Member]	Dec. 31, 2011 Southern California Edison	Jun. 30, 2014 Southern California Edison	Jun. 30, 2013 Southern California Edison	Jun. 30, 2014 Southern California Edison	Jun. 30, 2013 Southern California Edison	Mar. 27, 2014 Southern California Edison San Onofre (nuclear)	Feb. 01, 2012 Southern California Edison San Onofre (nuclear)	Mar. 31, 2014 Southern California Edison San Onofre (nuclear)	Jun. 30, 2013 Southern California Edison San Onofre (nuclear)	Jun. 30, 2014 Southern California Edison San Onofre (nuclear)	Jun. 30, 2013 Southern California Edison San Onofre (nuclear)	Jun. 06, 2013 Southern California Edison San Onofre (nuclear)	Dec. 31, 2013 Southern California Edison San Onofre (nuclear)	May 31, 2013 Southern California Edison San Onofre (nuclear)	Jun. 30, 2014 Southern California Edison San Onofre (nuclear) Replacement Steam Generators	Dec. 31, 2012 Southern California Edison San Onofre (nuclear) Replacement Steam Generators	Feb. 01, 2012 Southern California Edison San Onofre (nuclear) Replacement Steam Generators	Dec. 31, 2013 Southern California Edison San Onofre (nuclear) Property, plant and equipment	Jun. 30, 2014 Southern California Edison San Onofre (nuclear) Refunds of excess revenue	Dec. 31, 2013 Southern California Edison San Onofre (nuclear) Refunds of excess revenue	Jun. 30, 2014 Southern California Edison San Onofre (nuclear) 2012 Period	Jun. 30, 2014 Southern California Edison San Onofre (nuclear) 2013-2014 Periods	Feb. 22, 2014 Southern California Edison San Onofre (nuclear) Insurance Claims [Member]	May 31, 2013 Southern California Edison San Onofre (nuclear) Disallowance Of SGRP Investment [Member]	Jun. 30, 2014 Southern California Edison San Onofre (nuclear) Refund of SGRP Revenue Previously Recognized [Member]	Jun. 30, 2014 Southern California Edison San Onofre (nuclear) Refund Of Flow Through Tax Benefits [Member]	Jun. 30, 2014 Mitsubishi Heavy Industries Ltd [Member] San Onofre (nuclear)
Regulatory Assets [Line Items]
Settlement Agreement Subject Termination Period												6 months
Decommissioning Nuclear Facilities Net Investment																							$ 597
Incremental Inspection and Repair Costs																						99
Period For Rate Recovery													10 years
Authorized expenditures by authoritative body, market costs incurred																		680
Authorized Return on Preferred Equity Percentage																50.00%
Public Utilities, Approved Return on Equity, Percentage																											2.95%	2.62%
Public Utilities, Approved Incentive, Rate																5.00%
Amount of assets reclassified to a regulatory asset																				1,521
Impairment and other charges	0	575	231	575				0	575	231	575			231	575
Impairment and other charges net of tax														96			365
Cumulative Impact of Settlement																806														542	159	71
Cumulative Impact of Settlement, Net of Tax																461
Net regulatory asset																(1,370)			(1,300)					(1,560)	483	266
Regulatory assets								300		300
Insurance Claims, Estimated Amount						414.0																							325.0
Reduction in Policy Benefits Following Retirement of Assets																90.00%
Warranty Period																					20 years
Maximum Liability Per Purchase Agreement for Damages																																	138
Notice of intent to sue, notice time period					90 days
Loss Contingency, Damages Sought, Value							98									4,000
Loss Contingency Counter Claim Amount																																	$ 41