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Debt and Credit Agreements (Details) (USD $) |  |  |  |  |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Revolving credit facility maturing in May 2017 | Mar. 31, 2013 Southern California Edison | Dec. 31, 2012 Southern California Edison | Mar. 31, 2013 Southern California Edison First and refunding mortgage bonds | Mar. 31, 2013 Southern California Edison Revolving credit facility maturing in May 2017 | Mar. 31, 2013 Edison International Parent and Other Revolving credit facility maturing in May 2017 | Dec. 31, 2012 Edison International Parent and Other Revolving credit facility maturing in May 2017 | Mar. 31, 2013 Commercial paper Southern California Edison Revolving credit facility maturing in May 2017 | Dec. 31, 2012 Commercial paper Southern California Edison Revolving credit facility maturing in May 2017 | Mar. 31, 2013 Letters of credit Southern California Edison Revolving credit facility maturing in May 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of debt |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  | 3.90% |  |  |  |  |  |
Outstanding borrowings |  |  |  |  |  |  | 404,000,000 |  |  |  |  |
Weighted average interest rate (as a percent) |  |  |  |  |  |  |  | 1.485% |  | 0.32% | 0.37% |
Commitment |  |  | 1,250,000,000 |  |  |  | 2,750,000,000 |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  |  |  |  |  |  | 121,000,000
Letters of credit expiration period |  |  |  |  |  |  |  |  |  |  |  | 12 months
Short-term debt | $ 420,000,000 | $ 175,000,000 |  | $ 404,000,000 | $ 175,000,000 |  |  | $ 16,000,000 | $ 0 |  | $ 175,000,000 |

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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