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Compensation and Benefit Plans (Textual) (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 3 Months Ended | 6 Months Ended |  |  | 3 Months Ended | 6 Months Ended |  | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2013 Pension Plans | Jun. 30, 2012 Pension Plans | Jun. 30, 2013 Pension Plans | Jun. 30, 2012 Pension Plans | Jun. 30, 2013 Postretirement Benefits Other Than Pensions | Jun. 30, 2013 Southern California Edison | May 31, 2013 Southern California Edison | Dec. 31, 2012 Southern California Edison | Jun. 30, 2013 Southern California Edison Pension Plans | Jun. 30, 2012 Southern California Edison Pension Plans | Jun. 30, 2013 Southern California Edison Pension Plans | Jun. 30, 2012 Southern California Edison Pension Plans | Jun. 30, 2013 Southern California Edison Postretirement Benefits Other Than Pensions | May 31, 2013 Initial | May 31, 2013 Revised | Jun. 30, 2013 San Onofre [Member] Southern California Edison positions | Jun. 30, 2013 Decommissioning Plan San Onofre [Member] Southern California Edison positions
Pension and Other Postretirement Benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
San Onofre expected number of positions to be eliminated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 960 | 175
Defined Benefit Plan, Actuarial Gain (Loss) | $ 369 |  |  |  |  |  | $ 362 |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.75% | 4.25% |  |
Settlement costs |  | 49 | 0 | 49 | 0 |  |  |  |  | 48 | 0 | 48 | 0 |  |  |  |  |
Defined Benefit Plan, Unfunded Status of Plan |  |  |  |  |  |  |  | 658 | 1,100 |  |  |  |  |  |  |  |  |
Employer contributions |  |  |  | 104 |  | 15 |  |  |  |  |  | 94 |  | 15 |  |  |  |
Estimated future contributions in remainder of 2013 |  | $ 86 |  | $ 86 |  | $ 20 |  |  |  | $ 70 |  | $ 70 |  | $ 20 |  |  |  |

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- Definition Amount of gain (loss) from a decision to temporarily deviate from the substantive plan, or from a change in benefit obligation or plan asset value from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover or salary scale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=6514294 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=6749293 + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan in the current remaining fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. + References No definition available. + Details
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- Definition The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition The expected number of positions to be eliminated as a result of restructuring activities. + References No definition available. + Details
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