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Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss): |  |  |  |  |  |
Unrealized holding gain (loss) arising during the period | $ 0 |  | $ (21) |  | $ (12) |
Prior service cost (credit) arising during the period | 0 |  | (5) |  | 0 |
Increase (Decrease) in Accumulated Other Comprehensive Income |  |  |  |  |  |
Balance at the beginning of period | (87) |  | (100) | [1] |  |
Other | 2 |  | 0 |  |  |
Change | 74 |  | 13 |  |  |
Balance at the end of period | (13) |  | (87) |  | (100) | [1]
Unrealized Gain (Loss) on Cash Flow Hedges |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss): |  |  |  |  |  |
Unrealized holding gain (loss) arising during the period |  |  |  |  | 34 |
Pension and PBOP – Prior Service Cost |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss): |  |  |  |  |  |
Prior service cost (credit) arising during the period |  |  |  |  | 5 |
Pension and PBOP – Net Loss |  |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | 63 |  | 15 |  |  |
Reclassified from accumulated other comprehensive income | 9 | [2] | (2) | [2] |  |
Southern California Edison |  |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income |  |  |  |  |  |
Balance at the beginning of period | (29) |  | (24) |  |  |
Other | 2 |  | 0 |  |  |
Change | 18 |  | (5) |  |  |
Balance at the end of period | (11) |  | (29) |  |  |
Southern California Edison | Pension and PBOP – Net Loss |  |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | 13 |  | (9) |  |  |
Reclassified from accumulated other comprehensive income | $ 3 | [2] | $ 4 | [2] |  |
[1] | Excludes the amount of unrealized losses from cash flow hedges and prior service costs arising from pension and PBOP.
[2] | These items are included in the computation of net periodic pension and PBOP expense.

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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 Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 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=28358780&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 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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- Definition Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: 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=28358780&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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