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Other Investments (Amortized Cost and Fair Value of Nuclear Decommissioning Trusts) (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2010
Fair Value Disclosures:
Contributions received for decommissioning trusts			$ 23,000,000
Period of reviewing contributions from decommissioning trusts (in years)			3 years
Nuclear Decommissioning Trusts Disclosures
Amortized Cost	2,437,000,000		2,437,000,000		2,303,000,000
Fair Value	3,997,000,000	3,393,000,000	3,997,000,000	3,393,000,000	3,592,000,000	3,810,000,000	3,657,000,000	3,480,000,000
Proceeds from sale of securities	428,000,000	962,000,000	1,525,000,000	2,108,000,000
Unrealized holding gains, net of losses			1,600,000,000		1,300,000,000
Stocks
Nuclear Decommissioning Trusts Disclosures
Amortized Cost	957,000,000		957,000,000		865,000,000
Fair Value	2,227,000,000		2,227,000,000		1,899,000,000
Municipal bonds
Nuclear Decommissioning Trusts Disclosures
Longest maturity dates decommissioning trust investments (in years)			2054
Amortized Cost	520,000,000		520,000,000		625,000,000
Fair Value	654,000,000		654,000,000		756,000,000
U.S. government and agency securities
Nuclear Decommissioning Trusts Disclosures
Longest maturity dates decommissioning trust investments (in years)			2042
Amortized Cost	526,000,000		526,000,000		516,000,000
Fair Value	589,000,000		589,000,000		580,000,000
Corporate bonds
Nuclear Decommissioning Trusts Disclosures
Longest maturity dates decommissioning trust investments (in years)			2054
Amortized Cost	287,000,000		287,000,000		259,000,000
Fair Value	374,000,000		374,000,000		317,000,000
Short-term investments and receivables/payables
Nuclear Decommissioning Trusts Disclosures
Longest maturity dates decommissioning trust investments (in years)			One-year
Amortized Cost	147,000,000		147,000,000		38,000,000
Fair Value	$ 153,000,000		$ 153,000,000		$ 40,000,000

X

- Definition

The amount of decommissioning trust assets at amortized cost as of the balance sheet date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of contributions from customers into the decommissioning trusts.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

The maturity dates for decommissioning trust investments.

+ References

No definition available.

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X

- Definition

The period of reviewing and revising contributions from decommissioning trusts.

+ References

No definition available.

+ Details

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Namespace Prefix:	sce_
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- Details

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X

- Definition

This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 16

-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 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563

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X

- Definition

The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 143

-Paragraph 22

-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 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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X

- Definition

The cash inflow from the sale of assets held in a decommissioning trust fund.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15, 16

-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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