San Onofre Issues (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended			12 Months Ended		1 Months Ended		3 Months Ended		9 Months Ended			0 Months Ended	3 Months Ended		9 Months Ended	16 Months Ended			9 Months Ended	12 Months Ended				12 Months Ended	9 Months Ended			9 Months Ended				9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2013 San Onofre (nuclear)	Jun. 28, 2014 San Onofre (nuclear) Insurance Claims	Sep. 30, 2014 Southern California Edison	Dec. 31, 2011 Southern California Edison	Sep. 30, 2014 Southern California Edison	Sep. 30, 2013 Southern California Edison	Sep. 30, 2014 Southern California Edison	Sep. 30, 2013 Southern California Edison	Dec. 31, 2013 Southern California Edison	Feb. 01, 2012 Southern California Edison San Onofre (nuclear)	Jun. 30, 2014 Southern California Edison San Onofre (nuclear)	Mar. 31, 2014 Southern California Edison San Onofre (nuclear)	Sep. 30, 2014 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)	Sep. 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	Dec. 31, 2013 Southern California Edison San Onofre (nuclear) Refunds of excess revenue	Dec. 31, 2012 Southern California Edison San Onofre (nuclear) 2012 Period	Sep. 30, 2014 Southern California Edison San Onofre (nuclear) 2013-2014 Periods	Sep. 30, 2014 Southern California Edison San Onofre (nuclear) Insurance Claims	Jun. 28, 2014 Southern California Edison San Onofre (nuclear) Insurance Claims	Sep. 30, 2014 Southern California Edison San Onofre (nuclear) Other Insurance Claims	May 31, 2013 Southern California Edison San Onofre (nuclear) Disallowance Of SGRP Investment	Sep. 30, 2014 Southern California Edison San Onofre (nuclear) Refund of SGRP Revenue Previously Recognized	Sep. 30, 2014 Southern California Edison San Onofre (nuclear) Refund Of Flow Through Tax Benefits	Sep. 30, 2014 Mitsubishi Heavy Industries Ltd San Onofre (nuclear)	Sep. 30, 2014 San Onofre Southern California Edison	Dec. 31, 2013 San Onofre Southern California Edison
Regulatory Assets [Line Items]
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 (percent)																		5.00%
Amount of assets reclassified to a regulatory asset																					1,521
Impairment and other charges	(3)	0	228	575						0	0	231	575			575	231
Impairment and other charges net of tax																365	96
Cumulative Impact of Settlement																		806														542	159	71
Regulatory assets	7,329		7,329		7,241			7,329		7,329		7,329		7,241																						1,386	1,325
Regulatory liabilities	6,387		6,387		4,995			6,387		6,387		6,387		4,995																						677	0
Cumulative Impact of Settlement, Net of Tax																		461
Net regulatory asset																				(1,300)					(1,560)	266
Regulatory assets								300		300		300
Annual Contribution to Environmental Remediation Study																																				4
Period of Environmental Remediation Study Contribution (duration)																																				5 years
Insurance Claims, Estimated Amount							427.0																							334.0
Reduction in Policy Benefits Following Retirement of Assets (percent)																													90.00%
Ratepayer Allocation of Recovery from Recoveries (percent)																													95.00%		82.50%
Warranty Period (duration)																						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								84	98									4,000
Loss Contingency Counter Claim Amount																																			$ 41