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Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Increase (Decrease) in Accumulated Other Comprehensive Loss |  |  |
Balance at the beginning of period | $ (87) |  |
Net current-period other comprehensive loss | 0 |  | 21
Balance at the end of period | (87) |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Abstract] |  |  |
Tax expense | (98) |  | (91)
Total reclassification, net of tax | 298 |  | 112
Southern California Edison |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Loss |  |  |
Balance at the beginning of period | (29) |  |
Net current-period other comprehensive loss | (3) |  | 3
Balance at the end of period | (32) |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Abstract] |  |  |
Tax expense | (112) |  | (99)
Total reclassification, net of tax | 283 |  | 201
Accumulated Defined Benefit Plans Adjustment |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Loss |  |  |
Balance at the beginning of period | (87) |  |
Other comprehensive loss before reclassifications | (2) |  |
Amounts reclassified from accumulated other comprehensive loss | 2 | [1] |
Net current-period other comprehensive loss | 0 |  |
Balance at the end of period | (87) |  |
Accumulated Defined Benefit Plans Adjustment | Southern California Edison |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Loss |  |  |
Balance at the beginning of period | (29) |  |
Other comprehensive loss before reclassifications | (4) |  |
Amounts reclassified from accumulated other comprehensive loss | 1 | [1] |
Net current-period other comprehensive loss | (3) |  |
Balance at the end of period | (32) |  |
Accumulated Defined Benefit Plans Adjustment | Reclassification out of Accumulated Other Comprehensive Loss |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Abstract] |  |  |
Amortization of net loss included in net income | 3 |  |
Tax expense | 1 |  |
Total reclassification, net of tax | 2 |  |
Accumulated Defined Benefit Plans Adjustment | Reclassification out of Accumulated Other Comprehensive Loss | Southern California Edison |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Abstract] |  |  |
Amortization of net loss included in net income | 2 |  |
Tax expense | 1 |  |
Total reclassification, net of tax | $ 1 |  |
[1] | These items are included in the computation of net periodic pension and PBOP expense. See Note 8 for additional information.

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 26 -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 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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. + Details
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