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Fair Value Measurements (Changes in Level 3 Net Derivative Assets and Liabilities) (Details) (Level 3, USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Level 3
Fair Value Disclosures Level 3
Fair value of net assets (liabilities) at beginning of period	$ (739)		$ (359)		$ (754)		$ 6
Total realized/unrealized gains (losses), net:
Included in regulatory assets	(180)	[1]	(128)	[1]	(203)	[1]	(510)	[1]
Purchases	33		19		84		35
Settlements	(44)		(2)		(57)		(1)
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		0		0		0
Fair value of net liabilities at end of period	(930)		(470)		(930)		(470)
Change during the period in unrealized gains (losses) related to assets and liabilities held at the end of the period	$ (222)		$ (135)		$ (244)		$ (502)
[1] Due to regulatory mechanisms, SCE's realized and unrealized gains and losses are recorded as regulatory assets and liabilities.

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This element represents total gains or losses for the period (realized and unrealized), included in regulatory assets and liabilities measured at fair value on a recurring basis using unobservable inputs (level 3).

+ References

No definition available.

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This element represents the change during the period in unrealized gains (losses) for financial instruments, held at the end of the period, with unobservable inputs (level 3).

+ References

No definition available.

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Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ 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=7578670&loc=d3e19207-110258

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Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

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-Section 50

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Transfers into assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period.

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Transfers out of assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period.

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-Publisher FASB

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This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

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-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.

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