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San Onofre Issues (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended |  |  | 12 Months Ended |  |  |  |  | 3 Months Ended |  |
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Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 Southern California Edison | Mar. 31, 2013 Southern California Edison | Jun. 06, 2013 Southern California Edison San Onofre (nuclear) | Mar. 31, 2014 Southern California Edison San Onofre (nuclear) | Jun. 30, 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) | 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 | Mar. 31, 2014 Southern California Edison San Onofre (nuclear) Refunds of excess revenue | Dec. 31, 2013 Southern California Edison San Onofre (nuclear) Refunds of excess revenue | Mar. 31, 2014 Southern California Edison San Onofre (nuclear) 2012 Period | Mar. 31, 2014 Southern California Edison San Onofre (nuclear) 2013-2014 Periods | May 31, 2013 Southern California Edison San Onofre (nuclear) Disallowance Of SGRP Investment [Member] | Mar. 31, 2014 Southern California Edison San Onofre (nuclear) Refund of SGRP Revenue Previously Recognized [Member] | Mar. 31, 2014 Southern California Edison San Onofre (nuclear) Refund Of Flow Through Tax Benefits [Member]
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% |  |  |
Amount of assets reclassified to a regulatory asset |  |  |  |  |  |  |  |  | 1,521 |  |  |  |  |  |  |  |  |  |
Impairment and other charges | 231 | 0 | 231 | 0 |  | 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 | $ 371 | $ 266 |  |  |  |  |

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