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Fair Value Measurements (Level 3 Rollforward) (Details) (Southern California Edison, Level 3, USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Southern California Edison | Level 3 |  |  |  |  |  |  |  |
Fair Value Disclosures Level 3 [Roll Forward] |  |  |  |  |  |  |  |
Fair value of net liabilities at beginning of period | $ (773) |  | $ (882) |  | $ (805) |  | $ (791) |
Total realized/unrealized gains (losses): |  |  |  |  |  |  |  |
Included in regulatory assets and liabilities | (108) | [1] | (76) | [1] | (77) | [1] | (158) | [1]
Purchases | 8 |  | 20 |  | 15 |  | 38 |
Settlements | (5) |  | (29) |  | (11) |  | (56) |
Fair value of net liabilities at end of period | (878) |  | (967) |  | (878) |  | (967) |
Change during the period in unrealized losses related to assets and liabilities held at the end of the period | $ (116) |  | $ (43) |  | $ (84) |  | $ (125) |
[1] | Due to regulatory mechanisms, SCE's realized and unrealized gains and losses are recorded as regulatory assets and liabilities.

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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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