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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 |
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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 |  |

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